<?php
/**
 * @package Cpdf
 */
/**
 * Cpdf
 *
 *
 * A PHP class to provide the basic functionality to create a pdf document without
 * any requirement for additional modules.
 *
 * Note that they companion class CezPdf can be used to extend this class and dramatically
 * simplify the creation of documents.
 *
 * IMPORTANT NOTE
 * there is no warranty, implied or otherwise with this software.
 *
 * LICENCE
 * This code has been placed in the Public Domain for all to enjoy.
 *
 * @author        Wayne Munro <pdf@ros.co.nz>
 * @version       009
 * @package       Cpdf
 * @link          http://www.ros.co.nz/pdf
 */
class Cpdf{

	/**
	 * the current number of pdf objects in the document
	 */
	var $numObj = 0;
	/**
	 * this array contains all of the pdf objects, ready for final assembly
	 */
	var $objects = array();
	/**
	 * the objectId (number within the objects array) of the document catalog
	 */
	var $catalogId;
	/**
	 * array carrying information about the fonts that the system currently knows about
	 * used to ensure that a font is not loaded twice, among other things
	 */
	var $fonts = array();
	/**
	 * a record of the current font
	 */
	var $currentFont = '';
	/**
	 * the current base font
	 */
	var $currentBaseFont = '';
	/**
	 * the number of the current font within the font array
	 */
	var $currentFontNum = 0;
	/**
	 *
	 */
	var $currentNode;
	/**
	 * object number of the current page
	 */
	var $currentPage;
	/**
	 * object number of the currently active contents block
	 */
	var $currentContents;
	/**
	 * number of fonts within the system
	 */
	var $numFonts = 0;
	/**
	 * current colour for fill operations, defaults to inactive value, all three components should be between 0 and 1 inclusive when active
	 */
	var $currentColour = array('r' => -1, 'g' => -1, 'b' => -1);
	/**
	 * current colour for stroke operations (lines etc.)
	 */
	var $currentStrokeColour = array('r' => -1, 'g' => -1, 'b' => -1);
	/**
	 * current style that lines are drawn in
	 */
	var $currentLineStyle = '';
	/**
	 * an array which is used to save the state of the document, mainly the colours and styles
	 * it is used to temporarily change to another state, the change back to what it was before
	 */
	var $stateStack = array();
	/**
	 * number of elements within the state stack
	 */
	var $nStateStack = 0;
	/**
	 * number of page objects within the document
	 */
	var $numPages = 0;
	/**
	 * object Id storage stack
	 */
	var $stack = array();
	/**
	 * number of elements within the object Id storage stack
	 */
	var $nStack = 0;
	/**
	 * an array which contains information about the objects which are not firmly attached to pages
	 * these have been added with the addObject function
	 */
	var $looseObjects = array();
	/**
	 * array contains infomation about how the loose objects are to be added to the document
	 */
	var $addLooseObjects = array();
	/**
	 * the objectId of the information object for the document
	 * this contains authorship, title etc.
	 */
	var $infoObject = 0;
	/**
	 * number of images being tracked within the document
	 */
	var $numImages = 0;
	/**
	 * an array containing options about the document
	 * it defaults to turning on the compression of the objects
	 */
	var $options = array('compression' => 1);
	/**
	 * the objectId of the first page of the document
	 */
	var $firstPageId;
	/**
	 * used to track the last used value of the inter-word spacing, this is so that it is known
	 * when the spacing is changed.
	 */
	var $wordSpaceAdjust = 0;
	/**
	 * the object Id of the procset object
	 */
	var $procsetObjectId;
	/**
	 * store the information about the relationship between font families
	 * this used so that the code knows which font is the bold version of another font, etc.
	 * the value of this array is initialised in the constuctor function.
	 */
	var $fontFamilies = array();
	/**
	 * track if the current font is bolded or italicised
	 */
	var $currentTextState = '';
	/**
	 * messages are stored here during processing, these can be selected afterwards to give some useful debug information
	 */
	var $messages = '';
	/**
	 * the ancryption array for the document encryption is stored here
	 */
	var $arc4 = '';
	/**
	 * the object Id of the encryption information
	 */
	var $arc4_objnum = 0;
	/**
	 * the file identifier, used to uniquely identify a pdf document
	 */
	var $fileIdentifier = '';
	/**
	 * a flag to say if a document is to be encrypted or not
	 */
	var $encrypted = 0;
	/**
	 * the ancryption key for the encryption of all the document content (structure is not encrypted)
	 */
	var $encryptionKey = '';
	/**
	 * array which forms a stack to keep track of nested callback functions
	 */
	var $callback = array();
	/**
	 * the number of callback functions in the callback array
	 */
	var $nCallback = 0;
	/**
	 * store label->id pairs for named destinations, these will be used to replace internal links
	 * done this way so that destinations can be defined after the location that links to them
	 */
	var $destinations = array();
	/**
	 * store the stack for the transaction commands, each item in here is a record of the values of all the
	 * variables within the class, so that the user can rollback at will (from each 'start' command)
	 * note that this includes the objects array, so these can be large.
	 */
	var $checkpoint = '';
	/**
	 * class constructor
	 * this will start a new document
	 * @var array array of 4 numbers, defining the bottom left and upper right corner of the page. first two are normally zero.
	 */
	function Cpdf($pageSize = array(0, 0, 612, 792)){
		$this->newDocument($pageSize);

		// also initialize the font families that are known about already
		$this->setFontFamily('init');
		//  $this->fileIdentifier = md5('xxxxxxxx'.time());

	}

	/**
	 * Document object methods (internal use only)
	 *
	 * There is about one object method for each type of object in the pdf document
	 * Each function has the same call list ($id,$action,$options).
	 * $id = the object ID of the object, or what it is to be if it is being created
	 * $action = a string specifying the action to be performed, though ALL must support:
	 *           'new' - create the object with the id $id
	 *           'out' - produce the output for the pdf object
	 * $options = optional, a string or array containing the various parameters for the object
	 *
	 * These, in conjunction with the output function are the ONLY way for output to be produced
	 * within the pdf 'file'.
	 */

	/**
	 *destination object, used to specify the location for the user to jump to, presently on opening
	 */
	function o_destination($id, $action, $options = ''){
		if($action != 'new'){
			$o =& $this->objects[$id];
		}
		switch($action){
			case 'new':
				$this->objects[$id] = array('t' => 'destination', 'info' => array());
				$tmp = '';
				switch($options['type']){
					case 'XYZ':
					case 'FitR':
						$tmp = ' ' . $options['p3'] . $tmp;
					case 'FitH':
					case 'FitV':
					case 'FitBH':
					case 'FitBV':
						$tmp = ' ' . $options['p1'] . ' ' . $options['p2'] . $tmp;
					case 'Fit':
					case 'FitB':
						$tmp = $options['type'] . $tmp;
						$this->objects[$id]['info']['string'] = $tmp;
						$this->objects[$id]['info']['page'] = $options['page'];
				}
				break;
			case 'out':
				$tmp = $o['info'];
				$res = "\n" . $id . " 0 obj\n" . '[' . $tmp['page'] . ' 0 R /' . $tmp['string'] . "]\nendobj\n";
				return $res;
				break;
		}
	}

	/**
	 * set the viewer preferences
	 */
	function o_viewerPreferences($id, $action, $options = ''){
		if($action != 'new'){
			$o =& $this->objects[$id];
		}
		switch($action){
			case 'new':
				$this->objects[$id] = array('t' => 'viewerPreferences', 'info' => array());
				break;
			case 'add':
				foreach($options as $k => $v){
					switch($k){
						case 'HideToolbar':
						case 'HideMenubar':
						case 'HideWindowUI':
						case 'FitWindow':
						case 'CenterWindow':
						case 'NonFullScreenPageMode':
						case 'Direction':
							$o['info'][$k] = $v;
							break;
					}
				}
				break;
			case 'out':

				$res = "\n" . $id . " 0 obj\n" . '<< ';
				foreach($o['info'] as $k => $v){
					$res .= "\n/" . $k . ' ' . $v;
				}
				$res .= "\n>>\n";
				return $res;
				break;
		}
	}

	/**
	 * define the document catalog, the overall controller for the document
	 */
	function o_catalog($id, $action, $options = ''){
		if($action != 'new'){
			$o =& $this->objects[$id];
		}
		switch($action){
			case 'new':
				$this->objects[$id] = array('t' => 'catalog', 'info' => array());
				$this->catalogId = $id;
				break;
			case 'outlines':
			case 'pages':
			case 'openHere':
				$o['info'][$action] = $options;
				break;
			case 'viewerPreferences':
				if(!isset($o['info']['viewerPreferences'])){
					$this->numObj++;
					$this->o_viewerPreferences($this->numObj, 'new');
					$o['info']['viewerPreferences'] = $this->numObj;
				}
				$vp = $o['info']['viewerPreferences'];
				$this->o_viewerPreferences($vp, 'add', $options);
				break;
			case 'out':
				$res = "\n" . $id . " 0 obj\n" . '<< /Type /Catalog';
				foreach($o['info'] as $k => $v){
					switch($k){
						case 'outlines':
							$res .= "\n" . '/Outlines ' . $v . ' 0 R';
							break;
						case 'pages':
							$res .= "\n" . '/Pages ' . $v . ' 0 R';
							break;
						case 'viewerPreferences':
							$res .= "\n" . '/ViewerPreferences ' . $o['info']['viewerPreferences'] . ' 0 R';
							break;
						case 'openHere':
							$res .= "\n" . '/OpenAction ' . $o['info']['openHere'] . ' 0 R';
							break;
					}
				}
				$res .= " >>\nendobj";
				return $res;
				break;
		}
	}

	/**
	 * object which is a parent to the pages in the document
	 */
	function o_pages($id, $action, $options = ''){
		if($action != 'new'){
			$o =& $this->objects[$id];
		}
		switch($action){
			case 'new':
				$this->objects[$id] = array('t' => 'pages', 'info' => array());
				$this->o_catalog($this->catalogId, 'pages', $id);
				break;
			case 'page':
				if(!is_array($options)){
					// then it will just be the id of the new page
					$o['info']['pages'][] = $options;
				} else{
					// then it should be an array having 'id','rid','pos', where rid=the page to which this one will be placed relative
					// and pos is either 'before' or 'after', saying where this page will fit.
					if(isset($options['id']) && isset($options['rid']) && isset($options['pos'])){
						$i = array_search($options['rid'], $o['info']['pages']);
						if(isset($o['info']['pages'][$i]) && $o['info']['pages'][$i] == $options['rid']){
							// then there is a match
							// make a space
							switch($options['pos']){
								case 'before':
									$k = $i;
									break;
								case 'after':
									$k = $i + 1;
									break;
								default:
									$k = -1;
									break;
							}
							if($k >= 0){
								for($j = count($o['info']['pages']) - 1; $j >= $k; $j--){
									$o['info']['pages'][$j + 1] = $o['info']['pages'][$j];
								}
								$o['info']['pages'][$k] = $options['id'];
							}
						}
					}
				}
				break;
			case 'procset':
				$o['info']['procset'] = $options;
				break;
			case 'mediaBox':
				$o['info']['mediaBox'] = $options; // which should be an array of 4 numbers
				break;
			case 'font':
				$o['info']['fonts'][] = array('objNum' => $options['objNum'], 'fontNum' => $options['fontNum']);
				break;
			case 'xObject':
				$o['info']['xObjects'][] = array('objNum' => $options['objNum'], 'label' => $options['label']);
				break;
			case 'out':
				if(count($o['info']['pages'])){
					$res = "\n" . $id . " 0 obj\n<< /Type /Pages\n/Kids [";
					foreach($o['info']['pages'] as $k => $v){
						$res .= $v . " 0 R\n";
					}
					$res .= "]\n/Count " . count($this->objects[$id]['info']['pages']);
					if((isset($o['info']['fonts']) && count($o['info']['fonts'])) || isset($o['info']['procset'])){
						$res .= "\n/Resources <<";
						if(isset($o['info']['procset'])){
							$res .= "\n/ProcSet " . $o['info']['procset'] . " 0 R";
						}
						if(isset($o['info']['fonts']) && count($o['info']['fonts'])){
							$res .= "\n/Font << ";
							foreach($o['info']['fonts'] as $finfo){
								$res .= "\n/F" . $finfo['fontNum'] . " " . $finfo['objNum'] . " 0 R";
							}
							$res .= " >>";
						}
						if(isset($o['info']['xObjects']) && count($o['info']['xObjects'])){
							$res .= "\n/XObject << ";
							foreach($o['info']['xObjects'] as $finfo){
								$res .= "\n/" . $finfo['label'] . " " . $finfo['objNum'] . " 0 R";
							}
							$res .= " >>";
						}
						$res .= "\n>>";
						if(isset($o['info']['mediaBox'])){
							$tmp = $o['info']['mediaBox'];
							$res .= "\n/MediaBox [" . sprintf('%.3f', $tmp[0]) . ' ' . sprintf('%.3f', $tmp[1]) . ' ' . sprintf('%.3f', $tmp[2]) . ' ' . sprintf('%.3f', $tmp[3]) . ']';
						}
					}
					$res .= "\n >>\nendobj";
				} else{
					$res = "\n" . $id . " 0 obj\n<< /Type /Pages\n/Count 0\n>>\nendobj";
				}
				return $res;
				break;
		}
	}

	/**
	 * define the outlines in the doc, empty for now
	 */
	function o_outlines($id, $action, $options = ''){
		if($action != 'new'){
			$o =& $this->objects[$id];
		}
		switch($action){
			case 'new':
				$this->objects[$id] = array('t' => 'outlines', 'info' => array('outlines' => array()));
				$this->o_catalog($this->catalogId, 'outlines', $id);
				break;
			case 'outline':
				$o['info']['outlines'][] = $options;
				break;
			case 'out':
				if(count($o['info']['outlines'])){
					$res = "\n" . $id . " 0 obj\n<< /Type /Outlines /Kids [";
					foreach($o['info']['outlines'] as $k => $v){
						$res .= $v . " 0 R ";
					}
					$res .= "] /Count " . count($o['info']['outlines']) . " >>\nendobj";
				} else{
					$res = "\n" . $id . " 0 obj\n<< /Type /Outlines /Count 0 >>\nendobj";
				}
				return $res;
				break;
		}
	}

	/**
	 * an object to hold the font description
	 */
	function o_font($id, $action, $options = ''){
		if($action != 'new'){
			$o =& $this->objects[$id];
		}
		switch($action){
			case 'new':
				$this->objects[$id] = array('t' => 'font', 'info' => array('name' => $options['name'], 'SubType' => 'Type1'));
				$fontNum = $this->numFonts;
				$this->objects[$id]['info']['fontNum'] = $fontNum;
				// deal with the encoding and the differences
				if(isset($options['differences'])){
					// then we'll need an encoding dictionary
					$this->numObj++;
					$this->o_fontEncoding($this->numObj, 'new', $options);
					$this->objects[$id]['info']['encodingDictionary'] = $this->numObj;
				} else {
					if(isset($options['encoding'])){
						// we can specify encoding here
						switch($options['encoding']){
							case 'WinAnsiEncoding':
							case 'MacRomanEncoding':
							case 'MacExpertEncoding':
								$this->objects[$id]['info']['encoding'] = $options['encoding'];
								break;
							case 'none':
								break;
							default:
								$this->objects[$id]['info']['encoding'] = 'WinAnsiEncoding';
								break;
						}
					} else{
						$this->objects[$id]['info']['encoding'] = 'WinAnsiEncoding';
					}
				}
				// also tell the pages node about the new font
				$this->o_pages($this->currentNode, 'font', array('fontNum' => $fontNum, 'objNum' => $id));
				break;
			case 'add':
				foreach($options as $k => $v){
					switch($k){
						case 'BaseFont':
							$o['info']['name'] = $v;
							break;
						case 'FirstChar':
						case 'LastChar':
						case 'Widths':
						case 'FontDescriptor':
						case 'SubType':
							$this->addMessage('o_font ' . $k . " : " . $v);
							$o['info'][$k] = $v;
							break;
					}
				}
				break;
			case 'out':
				$res = "\n" . $id . " 0 obj\n<< /Type /Font\n/Subtype /" . $o['info']['SubType'] . "\n";
				$res .= "/Name /F" . $o['info']['fontNum'] . "\n";
				$res .= "/BaseFont /" . $o['info']['name'] . "\n";
				if(isset($o['info']['encodingDictionary'])){
					// then place a reference to the dictionary
					$res .= "/Encoding " . $o['info']['encodingDictionary'] . " 0 R\n";
				} else {
					if(isset($o['info']['encoding'])){
						// use the specified encoding
						$res .= "/Encoding /" . $o['info']['encoding'] . "\n";
					}
				}
				if(isset($o['info']['FirstChar'])){
					$res .= "/FirstChar " . $o['info']['FirstChar'] . "\n";
				}
				if(isset($o['info']['LastChar'])){
					$res .= "/LastChar " . $o['info']['LastChar'] . "\n";
				}
				if(isset($o['info']['Widths'])){
					$res .= "/Widths " . $o['info']['Widths'] . " 0 R\n";
				}
				if(isset($o['info']['FontDescriptor'])){
					$res .= "/FontDescriptor " . $o['info']['FontDescriptor'] . " 0 R\n";
				}
				$res .= ">>\nendobj";
				return $res;
				break;
		}
	}

	/**
	 * a font descriptor, needed for including additional fonts
	 */
	function o_fontDescriptor($id, $action, $options = ''){
		if($action != 'new'){
			$o =& $this->objects[$id];
		}
		switch($action){
			case 'new':
				$this->objects[$id] = array('t' => 'fontDescriptor', 'info' => $options);
				break;
			case 'out':
				$res = "\n" . $id . " 0 obj\n<< /Type /FontDescriptor\n";
				foreach($o['info'] as $label => $value){
					switch($label){
						case 'Ascent':
						case 'CapHeight':
						case 'Descent':
						case 'Flags':
						case 'ItalicAngle':
						case 'StemV':
						case 'AvgWidth':
						case 'Leading':
						case 'MaxWidth':
						case 'MissingWidth':
						case 'StemH':
						case 'XHeight':
						case 'CharSet':
							if(strlen($value)){
								$res .= '/' . $label . ' ' . $value . "\n";
							}
							break;
						case 'FontFile':
						case 'FontFile2':
						case 'FontFile3':
							$res .= '/' . $label . ' ' . $value . " 0 R\n";
							break;
						case 'FontBBox':
							$res .= '/' . $label . ' [' . $value[0] . ' ' . $value[1] . ' ' . $value[2] . ' ' . $value[3] . "]\n";
							break;
						case 'FontName':
							$res .= '/' . $label . ' /' . $value . "\n";
							break;
					}
				}
				$res .= ">>\nendobj";
				return $res;
				break;
		}
	}

	/**
	 * the font encoding
	 */
	function o_fontEncoding($id, $action, $options = ''){
		if($action != 'new'){
			$o =& $this->objects[$id];
		}
		switch($action){
			case 'new':
				// the options array should contain 'differences' and maybe 'encoding'
				$this->objects[$id] = array('t' => 'fontEncoding', 'info' => $options);
				break;
			case 'out':
				$res = "\n" . $id . " 0 obj\n<< /Type /Encoding\n";
				if(!isset($o['info']['encoding'])){
					$o['info']['encoding'] = 'WinAnsiEncoding';
				}
				if($o['info']['encoding'] != 'none'){
					$res .= "/BaseEncoding /" . $o['info']['encoding'] . "\n";
				}
				$res .= "/Differences \n[";
				$onum = -100;
				foreach($o['info']['differences'] as $num => $label){
					if($num != $onum + 1){
						// we cannot make use of consecutive numbering
						$res .= "\n" . $num . " /" . $label;
					} else{
						$res .= " /" . $label;
					}
					$onum = $num;
				}
				$res .= "\n]\n>>\nendobj";
				return $res;
				break;
		}
	}

	/**
	 * the document procset, solves some problems with printing to old PS printers
	 */
	function o_procset($id, $action, $options = ''){
		if($action != 'new'){
			$o =& $this->objects[$id];
		}
		switch($action){
			case 'new':
				$this->objects[$id] = array('t' => 'procset', 'info' => array('PDF' => 1, 'Text' => 1));
				$this->o_pages($this->currentNode, 'procset', $id);
				$this->procsetObjectId = $id;
				break;
			case 'add':
				// this is to add new items to the procset list, despite the fact that this is considered
				// obselete, the items are required for printing to some postscript printers
				switch($options){
					case 'ImageB':
					case 'ImageC':
					case 'ImageI':
						$o['info'][$options] = 1;
						break;
				}
				break;
			case 'out':
				$res = "\n" . $id . " 0 obj\n[";
				foreach($o['info'] as $label => $val){
					$res .= '/' . $label . ' ';
				}
				$res .= "]\nendobj";
				return $res;
				break;
		}
	}

	/**
	 * define the document information
	 */
	function o_info($id, $action, $options = ''){
		if($action != 'new'){
			$o =& $this->objects[$id];
		}
		switch($action){
			case 'new':
				$this->infoObject = $id;
				$date = 'D:' . date('Ymd');
				$this->objects[$id] = array('t' => 'info', 'info' => array('Creator' => 'R and OS php pdf writer, http://www.ros.co.nz', 'CreationDate' => $date));
				break;
			case 'Title':
			case 'Author':
			case 'Subject':
			case 'Keywords':
			case 'Creator':
			case 'Producer':
			case 'CreationDate':
			case 'ModDate':
			case 'Trapped':
				$o['info'][$action] = $options;
				break;
			case 'out':
				if($this->encrypted){
					$this->encryptInit($id);
				}
				$res = "\n" . $id . " 0 obj\n<<\n";
				foreach($o['info'] as $k => $v){
					$res .= '/' . $k . ' (';
					if($this->encrypted){
						$res .= $this->filterText($this->ARC4($v));
					} else{
						$res .= $this->filterText($v);
					}
					$res .= ")\n";
				}
				$res .= ">>\nendobj";
				return $res;
				break;
		}
	}

	/**
	 * an action object, used to link to URLS initially
	 */
	function o_action($id, $action, $options = ''){
		if($action != 'new'){
			$o =& $this->objects[$id];
		}
		switch($action){
			case 'new':
				if(is_array($options)){
					$this->objects[$id] = array('t' => 'action', 'info' => $options, 'type' => $options['type']);
				} else{
					// then assume a URI action
					$this->objects[$id] = array('t' => 'action', 'info' => $options, 'type' => 'URI');
				}
				break;
			case 'out':
				if($this->encrypted){
					$this->encryptInit($id);
				}
				$res = "\n" . $id . " 0 obj\n<< /Type /Action";
				switch($o['type']){
					case 'ilink':
						// there will be an 'label' setting, this is the name of the destination
						$res .= "\n/S /GoTo\n/D " . $this->destinations[(string)$o['info']['label']] . " 0 R";
						break;
					case 'URI':
						$res .= "\n/S /URI\n/URI (";
						if($this->encrypted){
							$res .= $this->filterText($this->ARC4($o['info']));
						} else{
							$res .= $this->filterText($o['info']);
						}
						$res .= ")";
						break;
				}
				$res .= "\n>>\nendobj";
				return $res;
				break;
		}
	}

	/**
	 * an annotation object, this will add an annotation to the current page.
	 * initially will support just link annotations
	 */
	function o_annotation($id, $action, $options = ''){
		if($action != 'new'){
			$o =& $this->objects[$id];
		}
		switch($action){
			case 'new':
				// add the annotation to the current page
				$pageId = $this->currentPage;
				$this->o_page($pageId, 'annot', $id);
				// and add the action object which is going to be required
				switch($options['type']){
					case 'link':
						$this->objects[$id] = array('t' => 'annotation', 'info' => $options);
						$this->numObj++;
						$this->o_action($this->numObj, 'new', $options['url']);
						$this->objects[$id]['info']['actionId'] = $this->numObj;
						break;
					case 'ilink':
						// this is to a named internal link
						$label = $options['label'];
						$this->objects[$id] = array('t' => 'annotation', 'info' => $options);
						$this->numObj++;
						$this->o_action($this->numObj, 'new', array('type' => 'ilink', 'label' => $label));
						$this->objects[$id]['info']['actionId'] = $this->numObj;
						break;
				}
				break;
			case 'out':
				$res = "\n" . $id . " 0 obj\n<< /Type /Annot";
				switch($o['info']['type']){
					case 'link':
					case 'ilink':
						$res .= "\n/Subtype /Link";
						break;
				}
				$res .= "\n/A " . $o['info']['actionId'] . " 0 R";
				$res .= "\n/Border [0 0 0]";
				$res .= "\n/H /I";
				$res .= "\n/Rect [ ";
				foreach($o['info']['rect'] as $v){
					$res .= sprintf("%.4f ", $v);
				}
				$res .= "]";
				$res .= "\n>>\nendobj";
				return $res;
				break;
		}
	}

	/**
	 * a page object, it also creates a contents object to hold its contents
	 */
	function o_page($id, $action, $options = ''){
		if($action != 'new'){
			$o =& $this->objects[$id];
		}
		switch($action){
			case 'new':
				$this->numPages++;
				$this->objects[$id] = array('t' => 'page', 'info' => array('parent' => $this->currentNode, 'pageNum' => $this->numPages));
				if(is_array($options)){
					// then this must be a page insertion, array shoudl contain 'rid','pos'=[before|after]
					$options['id'] = $id;
					$this->o_pages($this->currentNode, 'page', $options);
				} else{
					$this->o_pages($this->currentNode, 'page', $id);
				}
				$this->currentPage = $id;
				//make a contents object to go with this page
				$this->numObj++;
				$this->o_contents($this->numObj, 'new', $id);
				$this->currentContents = $this->numObj;
				$this->objects[$id]['info']['contents'] = array();
				$this->objects[$id]['info']['contents'][] = $this->numObj;
				$match = ($this->numPages % 2 ? 'odd' : 'even');
				foreach($this->addLooseObjects as $oId => $target){
					if($target == 'all' || $match == $target){
						$this->objects[$id]['info']['contents'][] = $oId;
					}
				}
				break;
			case 'content':
				$o['info']['contents'][] = $options;
				break;
			case 'annot':
				// add an annotation to this page
				if(!isset($o['info']['annot'])){
					$o['info']['annot'] = array();
				}
				// $options should contain the id of the annotation dictionary
				$o['info']['annot'][] = $options;
				break;
			case 'out':
				$res = "\n" . $id . " 0 obj\n<< /Type /Page";
				$res .= "\n/Parent " . $o['info']['parent'] . " 0 R";
				if(isset($o['info']['annot'])){
					$res .= "\n/Annots [";
					foreach($o['info']['annot'] as $aId){
						$res .= " " . $aId . " 0 R";
					}
					$res .= " ]";
				}
				$count = count($o['info']['contents']);
				if($count == 1){
					$res .= "\n/Contents " . $o['info']['contents'][0] . " 0 R";
				} else {
					if($count > 1){
						$res .= "\n/Contents [\n";
						foreach($o['info']['contents'] as $cId){
							$res .= $cId . " 0 R\n";
						}
						$res .= "]";
					}
				}
				$res .= "\n>>\nendobj";
				return $res;
				break;
		}
	}

	/**
	 * the contents objects hold all of the content which appears on pages
	 */
	function o_contents($id, $action, $options = ''){
		if($action != 'new'){
			$o =& $this->objects[$id];
		}
		switch($action){
			case 'new':
				$this->objects[$id] = array('t' => 'contents', 'c' => '', 'info' => array());
				if(strlen($options) && intval($options)){
					// then this contents is the primary for a page
					$this->objects[$id]['onPage'] = $options;
				} else {
					if($options == 'raw'){
						// then this page contains some other type of system object
						$this->objects[$id]['raw'] = 1;
					}
				}
				break;
			case 'add':
				// add more options to the decleration
				foreach($options as $k => $v){
					$o['info'][$k] = $v;
				}
			case 'out':
				$tmp = $o['c'];
				$res = "\n" . $id . " 0 obj\n";
				if(isset($this->objects[$id]['raw'])){
					$res .= $tmp;
				} else{
					$res .= "<<";
					if(function_exists('gzcompress') && $this->options['compression']){
						// then implement ZLIB based compression on this content stream
						$res .= " /Filter /FlateDecode";
						$tmp = gzcompress($tmp);
					}
					if($this->encrypted){
						$this->encryptInit($id);
						$tmp = $this->ARC4($tmp);
					}
					foreach($o['info'] as $k => $v){
						$res .= "\n/" . $k . ' ' . $v;
					}
					$res .= "\n/Length " . strlen($tmp) . " >>\nstream\n" . $tmp . "\nendstream";
				}
				$res .= "\nendobj\n";
				return $res;
				break;
		}
	}

	/**
	 * an image object, will be an XObject in the document, includes description and data
	 */
	function o_image($id, $action, $options = ''){
		if($action != 'new'){
			$o =& $this->objects[$id];
		}
		switch($action){
			case 'new':
				// make the new object
				$this->objects[$id] = array('t' => 'image', 'data' => $options['data'], 'info' => array());
				$this->objects[$id]['info']['Type'] = '/XObject';
				$this->objects[$id]['info']['Subtype'] = '/Image';
				$this->objects[$id]['info']['Width'] = $options['iw'];
				$this->objects[$id]['info']['Height'] = $options['ih'];
				if(!isset($options['type']) || $options['type'] == 'jpg'){
					if(!isset($options['channels'])){
						$options['channels'] = 3;
					}
					switch($options['channels']){
						case 1:
							$this->objects[$id]['info']['ColorSpace'] = '/DeviceGray';
							break;
						default:
							$this->objects[$id]['info']['ColorSpace'] = '/DeviceRGB';
							break;
					}
					$this->objects[$id]['info']['Filter'] = '/DCTDecode';
					$this->objects[$id]['info']['BitsPerComponent'] = 8;
				} else {
					if($options['type'] == 'png'){
						$this->objects[$id]['info']['Filter'] = '/FlateDecode';
						$this->objects[$id]['info']['DecodeParms'] = '<< /Predictor 15 /Colors ' . $options['ncolor'] . ' /Columns ' . $options['iw'] . ' /BitsPerComponent ' . $options['bitsPerComponent'] . '>>';
						if(strlen($options['pdata'])){
							$tmp = ' [ /Indexed /DeviceRGB ' . (strlen($options['pdata']) / 3 - 1) . ' ';
							$this->numObj++;
							$this->o_contents($this->numObj, 'new');
							$this->objects[$this->numObj]['c'] = $options['pdata'];
							$tmp .= $this->numObj . ' 0 R';
							$tmp .= ' ]';
							$this->objects[$id]['info']['ColorSpace'] = $tmp;
							if(isset($options['transparency'])){
								switch($options['transparency']['type']){
									case 'indexed':
										$tmp = ' [ ' . $options['transparency']['data'] . ' ' . $options['transparency']['data'] . '] ';
										$this->objects[$id]['info']['Mask'] = $tmp;
										break;
								}
							}
						} else{
							$this->objects[$id]['info']['ColorSpace'] = '/' . $options['color'];
						}
						$this->objects[$id]['info']['BitsPerComponent'] = $options['bitsPerComponent'];
					}
				}
				// assign it a place in the named resource dictionary as an external object, according to
				// the label passed in with it.
				$this->o_pages($this->currentNode, 'xObject', array('label' => $options['label'], 'objNum' => $id));
				// also make sure that we have the right procset object for it.
				$this->o_procset($this->procsetObjectId, 'add', 'ImageC');
				break;
			case 'out':
				$tmp = $o['data'];
				$res = "\n" . $id . " 0 obj\n<<";
				foreach($o['info'] as $k => $v){
					$res .= "\n/" . $k . ' ' . $v;
				}
				if($this->encrypted){
					$this->encryptInit($id);
					$tmp = $this->ARC4($tmp);
				}
				$res .= "\n/Length " . strlen($tmp) . " >>\nstream\n" . $tmp . "\nendstream\nendobj\n";
				return $res;
				break;
		}
	}

	/**
	 * encryption object.
	 */
	function o_encryption($id, $action, $options = ''){
		if($action != 'new'){
			$o =& $this->objects[$id];
		}
		switch($action){
			case 'new':
				// make the new object
				$this->objects[$id] = array('t' => 'encryption', 'info' => $options);
				$this->arc4_objnum = $id;
				// figure out the additional paramaters required
				$pad = chr(0x28) . chr(0xBF) . chr(0x4E) . chr(0x5E) . chr(0x4E) . chr(0x75) . chr(0x8A) . chr(0x41) . chr(0x64) . chr(0x00) . chr(0x4E) . chr(0x56) . chr(0xFF) . chr(0xFA) . chr(0x01) . chr(0x08) . chr(0x2E) . chr(0x2E) . chr(0x00) . chr(0xB6) . chr(0xD0) . chr(0x68) . chr(0x3E) . chr(0x80) . chr(0x2F) . chr(0x0C) . chr(0xA9) . chr(0xFE) . chr(0x64) . chr(0x53) . chr(0x69) . chr(0x7A);
				$len = strlen($options['owner']);
				if($len > 32){
					$owner = substr($options['owner'], 0, 32);
				} else {
					if($len < 32){
						$owner = $options['owner'] . substr($pad, 0, 32 - $len);
					} else{
						$owner = $options['owner'];
					}
				}
				$len = strlen($options['user']);
				if($len > 32){
					$user = substr($options['user'], 0, 32);
				} else {
					if($len < 32){
						$user = $options['user'] . substr($pad, 0, 32 - $len);
					} else{
						$user = $options['user'];
					}
				}
				$tmp = $this->md5_16($owner);
				$okey = substr($tmp, 0, 5);
				$this->ARC4_init($okey);
				$ovalue = $this->ARC4($user);
				$this->objects[$id]['info']['O'] = $ovalue;
				// now make the u value, phew.
				$tmp = $this->md5_16($user . $ovalue . chr($options['p']) . chr(255) . chr(255) . chr(255) . $this->fileIdentifier);
				$ukey = substr($tmp, 0, 5);

				$this->ARC4_init($ukey);
				$this->encryptionKey = $ukey;
				$this->encrypted = 1;
				$uvalue = $this->ARC4($pad);

				$this->objects[$id]['info']['U'] = $uvalue;
				$this->encryptionKey = $ukey;

				// initialize the arc4 array
				break;
			case 'out':
				$res = "\n" . $id . " 0 obj\n<<";
				$res .= "\n/Filter /Standard";
				$res .= "\n/V 1";
				$res .= "\n/R 2";
				$res .= "\n/O (" . $this->filterText($o['info']['O']) . ')';
				$res .= "\n/U (" . $this->filterText($o['info']['U']) . ')';
				// and the p-value needs to be converted to account for the twos-complement approach
				$o['info']['p'] = (($o['info']['p'] ^ 255) + 1) * -1;
				$res .= "\n/P " . ($o['info']['p']);
				$res .= "\n>>\nendobj\n";

				return $res;
				break;
		}
	}

	/**
	 * ARC4 functions
	 * A series of function to implement ARC4 encoding in PHP
	 */

	/**
	 * calculate the 16 byte version of the 128 bit md5 digest of the string
	 */
	function md5_16($string){
		$tmp = md5($string);
		$out = '';
		for($i = 0; $i <= 30; $i = $i + 2){
			$out .= chr(hexdec(substr($tmp, $i, 2)));
		}
		return $out;
	}

	/**
	 * initialize the encryption for processing a particular object
	 */
	function encryptInit($id){
		$tmp = $this->encryptionKey;
		$hex = dechex($id);
		if(strlen($hex) < 6){
			$hex = substr('000000', 0, 6 - strlen($hex)) . $hex;
		}
		$tmp .= chr(hexdec(substr($hex, 4, 2))) . chr(hexdec(substr($hex, 2, 2))) . chr(hexdec(substr($hex, 0, 2))) . chr(0) . chr(0);
		$key = $this->md5_16($tmp);
		$this->ARC4_init(substr($key, 0, 10));
	}

	/**
	 * initialize the ARC4 encryption
	 */
	function ARC4_init($key = ''){
		$this->arc4 = '';
		// setup the control array
		if(strlen($key) == 0){
			return;
		}
		$k = '';
		while(strlen($k) < 256){
			$k .= $key;
		}
		$k = substr($k, 0, 256);
		for($i = 0; $i < 256; $i++){
			$this->arc4 .= chr($i);
		}
		$j = 0;
		for($i = 0; $i < 256; $i++){
			$t = $this->arc4[$i];
			$j = ($j + ord($t) + ord($k[$i])) % 256;
			$this->arc4[$i] = $this->arc4[$j];
			$this->arc4[$j] = $t;
		}
	}

	/**
	 * ARC4 encrypt a text string
	 */
	function ARC4($text){
		$len = strlen($text);
		$a = 0;
		$b = 0;
		$c = $this->arc4;
		$out = '';
		for($i = 0; $i < $len; $i++){
			$a = ($a + 1) % 256;
			$t = $c[$a];
			$b = ($b + ord($t)) % 256;
			$c[$a] = $c[$b];
			$c[$b] = $t;
			$k = ord($c[(ord($c[$a]) + ord($c[$b])) % 256]);
			$out .= chr(ord($text[$i]) ^ $k);
		}

		return $out;
	}

	/**
	 * functions which can be called to adjust or add to the document
	 */

	/**
	 * add a link in the document to an external URL
	 */
	function addLink($url, $x0, $y0, $x1, $y1){
		$this->numObj++;
		$info = array('type' => 'link', 'url' => $url, 'rect' => array($x0, $y0, $x1, $y1));
		$this->o_annotation($this->numObj, 'new', $info);
	}

	/**
	 * add a link in the document to an internal destination (ie. within the document)
	 */
	function addInternalLink($label, $x0, $y0, $x1, $y1){
		$this->numObj++;
		$info = array('type' => 'ilink', 'label' => $label, 'rect' => array($x0, $y0, $x1, $y1));
		$this->o_annotation($this->numObj, 'new', $info);
	}

	/**
	 * set the encryption of the document
	 * can be used to turn it on and/or set the passwords which it will have.
	 * also the functions that the user will have are set here, such as print, modify, add
	 */
	function setEncryption($userPass = '', $ownerPass = '', $pc = array()){
		$p = bindec(11000000);

		$options = array(
			'print' => 4
		, 'modify' => 8
		, 'copy' => 16
		, 'add' => 32
		);
		foreach($pc as $k => $v){
			if($v && isset($options[$k])){
				$p += $options[$k];
			} else {
				if(isset($options[$v])){
					$p += $options[$v];
				}
			}
		}
		// implement encryption on the document
		if($this->arc4_objnum == 0){
			// then the block does not exist already, add it.
			$this->numObj++;
			if(strlen($ownerPass) == 0){
				$ownerPass = $userPass;
			}
			$this->o_encryption($this->numObj, 'new', array('user' => $userPass, 'owner' => $ownerPass, 'p' => $p));
		}
	}

	/**
	 * should be used for internal checks, not implemented as yet
	 */
	function checkAllHere(){
	}

	/**
	 * return the pdf stream as a string returned from the function
	 */
	function output($debug = 0){

		if($debug){
			// turn compression off
			$this->options['compression'] = 0;
		}

		if($this->arc4_objnum){
			$this->ARC4_init($this->encryptionKey);
		}

		$this->checkAllHere();

		$xref = array();
		$content = "%PDF-1.3\n%????\n";
		//  $content="%PDF-1.3\n";
		$pos = strlen($content);
		foreach($this->objects as $k => $v){
			$tmp = 'o_' . $v['t'];
			$cont = $this->$tmp($k, 'out');
			$content .= $cont;
			$xref[] = $pos;
			$pos += strlen($cont);
		}
		$content .= "\nxref\n0 " . (count($xref) + 1) . "\n0000000000 65535 f \n";
		foreach($xref as $p){
			$content .= substr('0000000000', 0, 10 - strlen($p)) . $p . " 00000 n \n";
		}
		$content .= "\ntrailer\n  << /Size " . (count($xref) + 1) . "\n     /Root 1 0 R\n     /Info " . $this->infoObject . " 0 R\n";
		// if encryption has been applied to this document then add the marker for this dictionary
		if($this->arc4_objnum > 0){
			$content .= "/Encrypt " . $this->arc4_objnum . " 0 R\n";
		}
		if(strlen($this->fileIdentifier)){
			$content .= "/ID[<" . $this->fileIdentifier . "><" . $this->fileIdentifier . ">]\n";
		}
		$content .= "  >>\nstartxref\n" . $pos . "\n%%EOF\n";
		return $content;
	}

	/**
	 * intialize a new document
	 * if this is called on an existing document results may be unpredictable, but the existing document would be lost at minimum
	 * this function is called automatically by the constructor function
	 *
	 * @access private
	 */
	function newDocument($pageSize = array(0, 0, 612, 792)){
		$this->numObj = 0;
		$this->objects = array();

		$this->numObj++;
		$this->o_catalog($this->numObj, 'new');

		$this->numObj++;
		$this->o_outlines($this->numObj, 'new');

		$this->numObj++;
		$this->o_pages($this->numObj, 'new');

		$this->o_pages($this->numObj, 'mediaBox', $pageSize);
		$this->currentNode = 3;

		$this->numObj++;
		$this->o_procset($this->numObj, 'new');

		$this->numObj++;
		$this->o_info($this->numObj, 'new');

		$this->numObj++;
		$this->o_page($this->numObj, 'new');

		// need to store the first page id as there is no way to get it to the user during 
		// startup
		$this->firstPageId = $this->currentContents;
	}

	/**
	 * open the font file and return a php structure containing it.
	 * first check if this one has been done before and saved in a form more suited to php
	 * note that if a php serialized version does not exist it will try and make one, but will
	 * require write access to the directory to do it... it is MUCH faster to have these serialized
	 * files.
	 *
	 * @access private
	 */
	function openFont($font){
		// assume that $font contains both the path and perhaps the extension to the file, split them
		$pos = strrpos($font, '/');
		if($pos === false){
			$dir = './';
			$name = $font;
		} else{
			$dir = substr($font, 0, $pos + 1);
			$name = substr($font, $pos + 1);
		}

		if(substr($name, -4) == '.afm'){
			$name = substr($name, 0, strlen($name) - 4);
		}
		$this->addMessage('openFont: ' . $font . ' - ' . $name);
		if(file_exists($dir . 'php_' . $name . '.afm')){
			$this->addMessage('openFont: php file exists ' . $dir . 'php_' . $name . '.afm');
			$tmp = file($dir . 'php_' . $name . '.afm');
			$this->fonts[$font] = unserialize($tmp[0]);
			if(!isset($this->fonts[$font]['_version_']) || $this->fonts[$font]['_version_'] < 1){
				// if the font file is old, then clear it out and prepare for re-creation
				$this->addMessage('openFont: clear out, make way for new version.');
				unset($this->fonts[$font]);
			}
		}
		if(!isset($this->fonts[$font]) && file_exists($dir . $name . '.afm')){
			// then rebuild the php_<font>.afm file from the <font>.afm file
			$this->addMessage('openFont: build php file from ' . $dir . $name . '.afm');
			$data = array();
			$file = file($dir . $name . '.afm');
			foreach($file as $rowA){
				$row = trim($rowA);
				$pos = strpos($row, ' ');
				if($pos){
					// then there must be some keyword
					$key = substr($row, 0, $pos);
					switch($key){
						case 'FontName':
						case 'FullName':
						case 'FamilyName':
						case 'Weight':
						case 'ItalicAngle':
						case 'IsFixedPitch':
						case 'CharacterSet':
						case 'UnderlinePosition':
						case 'UnderlineThickness':
						case 'Version':
						case 'EncodingScheme':
						case 'CapHeight':
						case 'XHeight':
						case 'Ascender':
						case 'Descender':
						case 'StdHW':
						case 'StdVW':
						case 'StartCharMetrics':
							$data[$key] = trim(substr($row, $pos));
							break;
						case 'FontBBox':
							$data[$key] = explode(' ', trim(substr($row, $pos)));
							break;
						case 'C':
							//C 39 ; WX 222 ; N quoteright ; B 53 463 157 718 ;
							$bits = explode(';', trim($row));
							$dtmp = array();
							foreach($bits as $bit){
								$bits2 = explode(' ', trim($bit));
								if(strlen($bits2[0])){
									if(count($bits2) > 2){
										$dtmp[$bits2[0]] = array();
										for($i = 1; $i < count($bits2); $i++){
											$dtmp[$bits2[0]][] = $bits2[$i];
										}
									} else {
										if(count($bits2) == 2){
											$dtmp[$bits2[0]] = $bits2[1];
										}
									}
								}
							}
							if($dtmp['C'] >= 0){
								$data['C'][$dtmp['C']] = $dtmp;
								$data['C'][$dtmp['N']] = $dtmp;
							} else{
								$data['C'][$dtmp['N']] = $dtmp;
							}
							break;
						case 'KPX':
							//KPX Adieresis yacute -40
							$bits = explode(' ', trim($row));
							$data['KPX'][$bits[1]][$bits[2]] = $bits[3];
							break;
					}
				}
			}
			$data['_version_'] = 1;
			$this->fonts[$font] = $data;
			$fp = fopen($dir . 'php_' . $name . '.afm', 'w');
			fwrite($fp, serialize($data));
			fclose($fp);
		} else {
			if(!isset($this->fonts[$font])){
				$this->addMessage('openFont: no font file found');
				//    echo 'Font not Found '.$font;
			}
		}
	}

	/**
	 * if the font is not loaded then load it and make the required object
	 * else just make it the current font
	 * the encoding array can contain 'encoding'=> 'none','WinAnsiEncoding','MacRomanEncoding' or 'MacExpertEncoding'
	 * note that encoding='none' will need to be used for symbolic fonts
	 * and 'differences' => an array of mappings between numbers 0->255 and character names.
	 *
	 */
	function selectFont($fontName, $encoding = '', $set = 1){
		if(!isset($this->fonts[$fontName])){
			// load the file
			$this->openFont($fontName);
			if(isset($this->fonts[$fontName])){
				$this->numObj++;
				$this->numFonts++;
				$pos = strrpos($fontName, '/');
				//      $dir=substr($fontName,0,$pos+1);
				$name = substr($fontName, $pos + 1);
				if(substr($name, -4) == '.afm'){
					$name = substr($name, 0, strlen($name) - 4);
				}
				$options = array('name' => $name);
				if(is_array($encoding)){
					// then encoding and differences might be set
					if(isset($encoding['encoding'])){
						$options['encoding'] = $encoding['encoding'];
					}
					if(isset($encoding['differences'])){
						$options['differences'] = $encoding['differences'];
					}
				} else {
					if(strlen($encoding)){
						// then perhaps only the encoding has been set
						$options['encoding'] = $encoding;
					}
				}
				$fontObj = $this->numObj;
				$this->o_font($this->numObj, 'new', $options);
				$this->fonts[$fontName]['fontNum'] = $this->numFonts;
				// if this is a '.afm' font, and there is a '.pfa' file to go with it ( as there
				// should be for all non-basic fonts), then load it into an object and put the
				// references into the font object
				$basefile = substr($fontName, 0, strlen($fontName) - 4);
				if(file_exists($basefile . '.pfb')){
					$fbtype = 'pfb';
				} else {
					if(file_exists($basefile . '.ttf')){
						$fbtype = 'ttf';
					} else{
						$fbtype = '';
					}
				}
				$fbfile = $basefile . '.' . $fbtype;

				//      $pfbfile = substr($fontName,0,strlen($fontName)-4).'.pfb';
				//      $ttffile = substr($fontName,0,strlen($fontName)-4).'.ttf';
				$this->addMessage('selectFont: checking for - ' . $fbfile);
				if(substr($fontName, -4) == '.afm' && strlen($fbtype)){
					$adobeFontName = $this->fonts[$fontName]['FontName'];
					//        $fontObj = $this->numObj;
					$this->addMessage('selectFont: adding font file - ' . $fbfile . ' - ' . $adobeFontName);
					// find the array of fond widths, and put that into an object.
					$firstChar = -1;
					$lastChar = 0;
					$widths = array();
					foreach($this->fonts[$fontName]['C'] as $num => $d){
						if(intval($num) > 0 || $num == '0'){
							if($lastChar > 0 && $num > $lastChar + 1){
								for($i = $lastChar + 1; $i < $num; $i++){
									$widths[] = 0;
								}
							}
							$widths[] = $d['WX'];
							if($firstChar == -1){
								$firstChar = $num;
							}
							$lastChar = $num;
						}
					}
					// also need to adjust the widths for the differences array
					if(isset($options['differences'])){
						foreach($options['differences'] as $charNum => $charName){
							if($charNum > $lastChar){
								for($i = $lastChar + 1; $i <= $charNum; $i++){
									$widths[] = 0;
								}
								$lastChar = $charNum;
							}
							if(isset($this->fonts[$fontName]['C'][$charName])){
								$widths[$charNum - $firstChar] = $this->fonts[$fontName]['C'][$charName]['WX'];
							}
						}
					}
					$this->addMessage('selectFont: FirstChar=' . $firstChar);
					$this->addMessage('selectFont: LastChar=' . $lastChar);
					$this->numObj++;
					$this->o_contents($this->numObj, 'new', 'raw');
					$this->objects[$this->numObj]['c'] .= '[';
					foreach($widths as $width){
						$this->objects[$this->numObj]['c'] .= ' ' . $width;
					}
					$this->objects[$this->numObj]['c'] .= ' ]';
					$widthid = $this->numObj;

					// load the pfb file, and put that into an object too.
					// note that pdf supports only binary format type 1 font files, though there is a 
					// simple utility to convert them from pfa to pfb.
					$fp = fopen($fbfile, 'rb');
					$data = fread($fp, filesize($fbfile));
					fclose($fp);

					// create the font descriptor
					$this->numObj++;
					$fontDescriptorId = $this->numObj;
					$this->numObj++;
					$pfbid = $this->numObj;
					// determine flags (more than a little flakey, hopefully will not matter much)
					$flags = 0;
					if($this->fonts[$fontName]['ItalicAngle'] != 0){
						$flags += pow(2, 6);
					}
					if($this->fonts[$fontName]['IsFixedPitch'] == 'true'){
						$flags += 1;
					}
					$flags += pow(2, 5); // assume non-sybolic

					$list = array('Ascent' => 'Ascender', 'CapHeight' => 'CapHeight', 'Descent' => 'Descender', 'FontBBox' => 'FontBBox', 'ItalicAngle' => 'ItalicAngle');
					$fdopt = array(
						'Flags' => $flags
					, 'FontName' => $adobeFontName
					, 'StemV' => 100 // don't know what the value for this should be!
					);
					foreach($list as $k => $v){
						if(isset($this->fonts[$fontName][$v])){
							$fdopt[$k] = $this->fonts[$fontName][$v];
						}
					}

					if($fbtype == 'pfb'){
						$fdopt['FontFile'] = $pfbid;
					} else {
						if($fbtype == 'ttf'){
							$fdopt['FontFile2'] = $pfbid;
						}
					}
					$this->o_fontDescriptor($fontDescriptorId, 'new', $fdopt);

					// embed the font program
					$this->o_contents($this->numObj, 'new');
					$this->objects[$pfbid]['c'] .= $data;
					// determine the cruicial lengths within this file
					if($fbtype == 'pfb'){
						$l1 = strpos($data, 'eexec') + 6;
						$l2 = strpos($data, '00000000') - $l1;
						$l3 = strlen($data) - $l2 - $l1;
						$this->o_contents($this->numObj, 'add', array('Length1' => $l1, 'Length2' => $l2, 'Length3' => $l3));
					} else {
						if($fbtype == 'ttf'){
							$l1 = strlen($data);
							$this->o_contents($this->numObj, 'add', array('Length1' => $l1));
						}
					}

					// tell the font object about all this new stuff
					$tmp = array(
						'BaseFont' => $adobeFontName, 'Widths' => $widthid
					, 'FirstChar' => $firstChar, 'LastChar' => $lastChar
					, 'FontDescriptor' => $fontDescriptorId
					);
					if($fbtype == 'ttf'){
						$tmp['SubType'] = 'TrueType';
					}
					$this->addMessage('adding extra info to font.(' . $fontObj . ')');
					foreach($tmp as $fk => $fv){
						$this->addMessage($fk . " : " . $fv);
					}
					$this->o_font($fontObj, 'add', $tmp);

				} else{
					$this->addMessage('selectFont: pfb or ttf file not found, ok if this is one of the 14 standard fonts');
				}

				// also set the differences here, note that this means that these will take effect only the 
				//first time that a font is selected, else they are ignored
				if(isset($options['differences'])){
					$this->fonts[$fontName]['differences'] = $options['differences'];
				}
			}
		}
		if($set && isset($this->fonts[$fontName])){
			// so if for some reason the font was not set in the last one then it will not be selected
			$this->currentBaseFont = $fontName;
			// the next line means that if a new font is selected, then the current text state will be
			// applied to it as well.
			$this->setCurrentFont();
		}
		return $this->currentFontNum;
	}

	/**
	 * sets up the current font, based on the font families, and the current text state
	 * note that this system is quite flexible, a <<b>><<i>> font can be completely different to a
	 * <<i>><<b>> font, and even <<b>><<b>> will have to be defined within the family to have meaning
	 * This function is to be called whenever the currentTextState is changed, it will update
	 * the currentFont setting to whatever the appropriatte family one is.
	 * If the user calls selectFont themselves then that will reset the currentBaseFont, and the currentFont
	 * This function will change the currentFont to whatever it should be, but will not change the
	 * currentBaseFont.
	 *
	 * @access private
	 */
	function setCurrentFont(){
		if(strlen($this->currentBaseFont) == 0){
			// then assume an initial font
			$this->selectFont('./fonts/Helvetica.afm');
		}
		$cf = substr($this->currentBaseFont, strrpos($this->currentBaseFont, '/') + 1);
		if(strlen($this->currentTextState)
			&& isset($this->fontFamilies[$cf])
			&& isset($this->fontFamilies[$cf][$this->currentTextState])
		){
			// then we are in some state or another
			// and this font has a family, and the current setting exists within it
			// select the font, then return it
			$nf = substr($this->currentBaseFont, 0, strrpos($this->currentBaseFont, '/') + 1) . $this->fontFamilies[$cf][$this->currentTextState];
			$this->selectFont($nf, '', 0);
			$this->currentFont = $nf;
			$this->currentFontNum = $this->fonts[$nf]['fontNum'];
		} else{
			// the this font must not have the right family member for the current state
			// simply assume the base font
			$this->currentFont = $this->currentBaseFont;
			$this->currentFontNum = $this->fonts[$this->currentFont]['fontNum'];
		}
	}

	/**
	 * function for the user to find out what the ID is of the first page that was created during
	 * startup - useful if they wish to add something to it later.
	 */
	function getFirstPageId(){
		return $this->firstPageId;
	}

	/**
	 * add content to the currently active object
	 *
	 * @access private
	 */
	function addContent($content){
		$this->objects[$this->currentContents]['c'] .= $content;
	}

	/**
	 * sets the colour for fill operations
	 */
	function setColor($r, $g, $b, $force = 0){
		if($r >= 0 && ($force || $r != $this->currentColour['r'] || $g != $this->currentColour['g'] || $b != $this->currentColour['b'])){
			$this->objects[$this->currentContents]['c'] .= "\n" . sprintf('%.3f', $r) . ' ' . sprintf('%.3f', $g) . ' ' . sprintf('%.3f', $b) . ' rg';
			$this->currentColour = array('r' => $r, 'g' => $g, 'b' => $b);
		}
	}

	/**
	 * sets the colour for stroke operations
	 */
	function setStrokeColor($r, $g, $b, $force = 0){
		if($r >= 0 && ($force || $r != $this->currentStrokeColour['r'] || $g != $this->currentStrokeColour['g'] || $b != $this->currentStrokeColour['b'])){
			$this->objects[$this->currentContents]['c'] .= "\n" . sprintf('%.3f', $r) . ' ' . sprintf('%.3f', $g) . ' ' . sprintf('%.3f', $b) . ' RG';
			$this->currentStrokeColour = array('r' => $r, 'g' => $g, 'b' => $b);
		}
	}

	/**
	 * draw a line from one set of coordinates to another
	 */
	function line($x1, $y1, $x2, $y2){
		$this->objects[$this->currentContents]['c'] .= "\n" . sprintf('%.3f', $x1) . ' ' . sprintf('%.3f', $y1) . ' m ' . sprintf('%.3f', $x2) . ' ' . sprintf('%.3f', $y2) . ' l S';
	}

	/**
	 * draw a bezier curve based on 4 control points
	 */
	function curve($x0, $y0, $x1, $y1, $x2, $y2, $x3, $y3){
		// in the current line style, draw a bezier curve from (x0,y0) to (x3,y3) using the other two points
		// as the control points for the curve.
		$this->objects[$this->currentContents]['c'] .= "\n" . sprintf('%.3f', $x0) . ' ' . sprintf('%.3f', $y0) . ' m ' . sprintf('%.3f', $x1) . ' ' . sprintf('%.3f', $y1);
		$this->objects[$this->currentContents]['c'] .= ' ' . sprintf('%.3f', $x2) . ' ' . sprintf('%.3f', $y2) . ' ' . sprintf('%.3f', $x3) . ' ' . sprintf('%.3f', $y3) . ' c S';
	}

	/**
	 * draw a part of an ellipse
	 */
	function partEllipse($x0, $y0, $astart, $afinish, $r1, $r2 = 0, $angle = 0, $nSeg = 8){
		$this->ellipse($x0, $y0, $r1, $r2, $angle, $nSeg, $astart, $afinish, 0);
	}

	/**
	 * draw a filled ellipse
	 */
	function filledEllipse($x0, $y0, $r1, $r2 = 0, $angle = 0, $nSeg = 8, $astart = 0, $afinish = 360){
		return $this->ellipse($x0, $y0, $r1, $r2 = 0, $angle, $nSeg, $astart, $afinish, 1, 1);
	}

	/**
	 * draw an ellipse
	 * note that the part and filled ellipse are just special cases of this function
	 *
	 * draws an ellipse in the current line style
	 * centered at $x0,$y0, radii $r1,$r2
	 * if $r2 is not set, then a circle is drawn
	 * nSeg is not allowed to be less than 2, as this will simply draw a line (and will even draw a
	 * pretty crappy shape at 2, as we are approximating with bezier curves.
	 */
	function ellipse($x0, $y0, $r1, $r2 = 0, $angle = 0, $nSeg = 8, $astart = 0, $afinish = 360, $close = 1, $fill = 0){
		if($r1 == 0){
			return;
		}
		if($r2 == 0){
			$r2 = $r1;
		}
		if($nSeg < 2){
			$nSeg = 2;
		}

		$astart = deg2rad((float)$astart);
		$afinish = deg2rad((float)$afinish);
		$totalAngle = $afinish - $astart;

		$dt = $totalAngle / $nSeg;
		$dtm = $dt / 3;

		if($angle != 0){
			$a = -1 * deg2rad((float)$angle);
			$tmp = "\n q ";
			$tmp .= sprintf('%.3f', cos($a)) . ' ' . sprintf('%.3f', (-1.0 * sin($a))) . ' ' . sprintf('%.3f', sin($a)) . ' ' . sprintf('%.3f', cos($a)) . ' ';
			$tmp .= sprintf('%.3f', $x0) . ' ' . sprintf('%.3f', $y0) . ' cm';
			$this->objects[$this->currentContents]['c'] .= $tmp;
			$x0 = 0;
			$y0 = 0;
		}

		$t1 = $astart;
		$a0 = $x0 + $r1 * cos($t1);
		$b0 = $y0 + $r2 * sin($t1);
		$c0 = -$r1 * sin($t1);
		$d0 = $r2 * cos($t1);

		$this->objects[$this->currentContents]['c'] .= "\n" . sprintf('%.3f', $a0) . ' ' . sprintf('%.3f', $b0) . ' m ';
		for($i = 1; $i <= $nSeg; $i++){
			// draw this bit of the total curve
			$t1 = $i * $dt + $astart;
			$a1 = $x0 + $r1 * cos($t1);
			$b1 = $y0 + $r2 * sin($t1);
			$c1 = -$r1 * sin($t1);
			$d1 = $r2 * cos($t1);
			$this->objects[$this->currentContents]['c'] .= "\n" . sprintf('%.3f', ($a0 + $c0 * $dtm)) . ' ' . sprintf('%.3f', ($b0 + $d0 * $dtm));
			$this->objects[$this->currentContents]['c'] .= ' ' . sprintf('%.3f', ($a1 - $c1 * $dtm)) . ' ' . sprintf('%.3f', ($b1 - $d1 * $dtm)) . ' ' . sprintf('%.3f', $a1) . ' ' . sprintf('%.3f', $b1) . ' c';
			$a0 = $a1;
			$b0 = $b1;
			$c0 = $c1;
			$d0 = $d1;
		}
		if($fill){
			$this->objects[$this->currentContents]['c'] .= ' f';
		} else{
			if($close){
				$this->objects[$this->currentContents]['c'] .= ' s'; // small 's' signifies closing the path as well
			} else{
				$this->objects[$this->currentContents]['c'] .= ' S';
			}
		}
		if($angle != 0){
			$this->objects[$this->currentContents]['c'] .= ' Q';
		}
	}

	/**
	 * this sets the line drawing style.
	 * width, is the thickness of the line in user units
	 * cap is the type of cap to put on the line, values can be 'butt','round','square'
	 *    where the diffference between 'square' and 'butt' is that 'square' projects a flat end past the
	 *    end of the line.
	 * join can be 'miter', 'round', 'bevel'
	 * dash is an array which sets the dash pattern, is a series of length values, which are the lengths of the
	 *   on and off dashes.
	 *   (2) represents 2 on, 2 off, 2 on , 2 off ...
	 *   (2,1) is 2 on, 1 off, 2 on, 1 off.. etc
	 * phase is a modifier on the dash pattern which is used to shift the point at which the pattern starts.
	 */
	function setLineStyle($width = 1, $cap = '', $join = '', $dash = '', $phase = 0){

		// this is quite inefficient in that it sets all the parameters whenever 1 is changed, but will fix another day
		$string = '';
		if($width > 0){
			$string .= $width . ' w';
		}
		$ca = array('butt' => 0, 'round' => 1, 'square' => 2);
		if(isset($ca[$cap])){
			$string .= ' ' . $ca[$cap] . ' J';
		}
		$ja = array('miter' => 0, 'round' => 1, 'bevel' => 2);
		if(isset($ja[$join])){
			$string .= ' ' . $ja[$join] . ' j';
		}
		if(is_array($dash)){
			$string .= ' [';
			foreach($dash as $len){
				$string .= ' ' . $len;
			}
			$string .= ' ] ' . $phase . ' d';
		}
		$this->currentLineStyle = $string;
		$this->objects[$this->currentContents]['c'] .= "\n" . $string;
	}

	/**
	 * draw a polygon, the syntax for this is similar to the GD polygon command
	 */
	function polygon($p, $np, $f = 0){
		$this->objects[$this->currentContents]['c'] .= "\n";
		$this->objects[$this->currentContents]['c'] .= sprintf('%.3f', $p[0]) . ' ' . sprintf('%.3f', $p[1]) . ' m ';
		for($i = 2; $i < $np * 2; $i = $i + 2){
			$this->objects[$this->currentContents]['c'] .= sprintf('%.3f', $p[$i]) . ' ' . sprintf('%.3f', $p[$i + 1]) . ' l ';
		}
		if($f == 1){
			$this->objects[$this->currentContents]['c'] .= ' f';
		} else{
			$this->objects[$this->currentContents]['c'] .= ' S';
		}
	}

	/**
	 * a filled rectangle, note that it is the width and height of the rectangle which are the secondary paramaters, not
	 * the coordinates of the upper-right corner
	 */
	function filledRectangle($x1, $y1, $width, $height){
		$this->objects[$this->currentContents]['c'] .= "\n" . sprintf('%.3f', $x1) . ' ' . sprintf('%.3f', $y1) . ' ' . sprintf('%.3f', $width) . ' ' . sprintf('%.3f', $height) . ' re f';
	}

	/**
	 * draw a rectangle, note that it is the width and height of the rectangle which are the secondary paramaters, not
	 * the coordinates of the upper-right corner
	 */
	function rectangle($x1, $y1, $width, $height){
		$this->objects[$this->currentContents]['c'] .= "\n" . sprintf('%.3f', $x1) . ' ' . sprintf('%.3f', $y1) . ' ' . sprintf('%.3f', $width) . ' ' . sprintf('%.3f', $height) . ' re S';
	}

	/**
	 * add a new page to the document
	 * this also makes the new page the current active object
	 */
	function newPage($insert = 0, $id = 0, $pos = 'after'){

		// if there is a state saved, then go up the stack closing them
		// then on the new page, re-open them with the right setings

		if($this->nStateStack){
			for($i = $this->nStateStack; $i >= 1; $i--){
				$this->restoreState($i);
			}
		}

		$this->numObj++;
		if($insert){
			// the id from the ezPdf class is the od of the contents of the page, not the page object itself
			// query that object to find the parent
			$rid = $this->objects[$id]['onPage'];
			$opt = array('rid' => $rid, 'pos' => $pos);
			$this->o_page($this->numObj, 'new', $opt);
		} else{
			$this->o_page($this->numObj, 'new');
		}
		// if there is a stack saved, then put that onto the page
		if($this->nStateStack){
			for($i = 1; $i <= $this->nStateStack; $i++){
				$this->saveState($i);
			}
		}
		// and if there has been a stroke or fill colour set, then transfer them
		if($this->currentColour['r'] >= 0){
			$this->setColor($this->currentColour['r'], $this->currentColour['g'], $this->currentColour['b'], 1);
		}
		if($this->currentStrokeColour['r'] >= 0){
			$this->setStrokeColor($this->currentStrokeColour['r'], $this->currentStrokeColour['g'], $this->currentStrokeColour['b'], 1);
		}

		// if there is a line style set, then put this in too
		if(strlen($this->currentLineStyle)){
			$this->objects[$this->currentContents]['c'] .= "\n" . $this->currentLineStyle;
		}

		// the call to the o_page object set currentContents to the present page, so this can be returned as the page id
		return $this->currentContents;
	}

	/**
	 * output the pdf code, streaming it to the browser
	 * the relevant headers are set so that hopefully the browser will recognise it
	 */
	function stream($options = ''){
		// setting the options allows the adjustment of the headers
		// values at the moment are:
		// 'Content-Disposition'=>'filename'  - sets the filename, though not too sure how well this will 
		//        work as in my trial the browser seems to use the filename of the php file with .pdf on the end
		// 'Accept-Ranges'=>1 or 0 - if this is not set to 1, then this header is not included, off by default
		//    this header seems to have caused some problems despite tha fact that it is supposed to solve
		//    them, so I am leaving it off by default.
		// 'compress'=> 1 or 0 - apply content stream compression, this is on (1) by default
		if(!is_array($options)){
			$options = array();
		}
		if(isset($options['compress']) && $options['compress'] == 0){
			$tmp = $this->output(1);
		} else{
			$tmp = $this->output();
		}
		header("Content-type: application/pdf");
		header("Content-Length: " . strlen(ltrim($tmp)));
		$fileName = (isset($options['Content-Disposition']) ? $options['Content-Disposition'] : 'file.pdf');
		header("Content-Disposition: inline; filename=" . $fileName);
		if(isset($options['Accept-Ranges']) && $options['Accept-Ranges'] == 1){
			header("Accept-Ranges: " . strlen(ltrim($tmp)));
		}
		echo ltrim($tmp);
	}

	/**
	 * return the height in units of the current font in the given size
	 */
	function getFontHeight($size){
		if(!$this->numFonts){
			$this->selectFont('./fonts/Helvetica');
		}
		// for the current font, and the given size, what is the height of the font in user units
		$h = $this->fonts[$this->currentFont]['FontBBox'][3] - $this->fonts[$this->currentFont]['FontBBox'][1];
		return $size * $h / 1000;
	}

	/**
	 * return the font decender, this will normally return a negative number
	 * if you add this number to the baseline, you get the level of the bottom of the font
	 * it is in the pdf user units
	 */
	function getFontDecender($size){
		// note that this will most likely return a negative value
		if(!$this->numFonts){
			$this->selectFont('./fonts/Helvetica');
		}
		$h = $this->fonts[$this->currentFont]['FontBBox'][1];
		return $size * $h / 1000;
	}

	/**
	 * filter the text, this is applied to all text just before being inserted into the pdf document
	 * it escapes the various things that need to be escaped, and so on
	 *
	 * @access private
	 */
	function filterText($text){
		$text = str_replace('\\', '\\\\', $text);
		$text = str_replace('(', '\(', $text);
		$text = str_replace(')', '\)', $text);
		$text = str_replace('&lt;', '<', $text);
		$text = str_replace('&gt;', '>', $text);
		$text = str_replace('&#039;', '\'', $text);
		$text = str_replace('&quot;', '"', $text);
		$text = str_replace('&amp;', '&', $text);

		return $text;
	}

	/**
	 * given a start position and information about how text is to be laid out, calculate where
	 * on the page the text will end
	 *
	 * @access private
	 */
	function PRVTgetTextPosition($x, $y, $angle, $size, $wa, $text){
		// given this information return an array containing x and y for the end position as elements 0 and 1
		$w = $this->getTextWidth($size, $text);
		// need to adjust for the number of spaces in this text
		$words = explode(' ', $text);
		$nspaces = count($words) - 1;
		$w += $wa * $nspaces;
		$a = deg2rad((float)$angle);
		return array(cos($a) * $w + $x, -sin($a) * $w + $y);
	}

	/**
	 * wrapper function for PRVTcheckTextDirective1
	 *
	 * @access private
	 */
	function PRVTcheckTextDirective(&$text, $i, &$f){
		$x = 0;
		$y = 0;
		return $this->PRVTcheckTextDirective1($text, $i, $f, 0, $x, $y);
	}

	/**
	 * checks if the text stream contains a control directive
	 * if so then makes some changes and returns the number of characters involved in the directive
	 * this has been re-worked to include everything neccesary to fins the current writing point, so that
	 * the location can be sent to the callback function if required
	 * if the directive does not require a font change, then $f should be set to 0
	 *
	 * @access private
	 */
	function PRVTcheckTextDirective1(&$text, $i, &$f, $final, &$x, &$y, $size = 0, $angle = 0, $wordSpaceAdjust = 0){
		$directive = 0;
		$j = $i;
		if($text[$j] == '<'){
			$j++;
			switch($text[$j]){
				case '/':
					$j++;
					if(strlen($text) <= $j){
						return $directive;
					}
					switch($text[$j]){
						case 'b':
						case 'i':
							$j++;
							if($text[$j] == '>'){
								$p = strrpos($this->currentTextState, $text[$j - 1]);
								if($p !== false){
									// then there is one to remove
									$this->currentTextState = substr($this->currentTextState, 0, $p) . substr($this->currentTextState, $p + 1);
								}
								$directive = $j - $i + 1;
							}
							break;
						case 'c':
							// this this might be a callback function
							$j++;
							$k = strpos($text, '>', $j);
							if($k !== false && $text[$j] == ':'){
								// then this will be treated as a callback directive
								$directive = $k - $i + 1;
								$f = 0;
								// split the remainder on colons to get the function name and the paramater
								$tmp = substr($text, $j + 1, $k - $j - 1);
								$b1 = strpos($tmp, ':');
								if($b1 !== false){
									$func = substr($tmp, 0, $b1);
									$parm = substr($tmp, $b1 + 1);
								} else{
									$func = $tmp;
									$parm = '';
								}
								if(!isset($func) || !strlen(trim($func))){
									$directive = 0;
								} else{
									// only call the function if this is the final call
									if($final){
										// need to assess the text position, calculate the text width to this point
										// can use getTextWidth to find the text width I think
										$tmp = $this->PRVTgetTextPosition($x, $y, $angle, $size, $wordSpaceAdjust, substr($text, 0, $i));
										$info = array('x' => $tmp[0], 'y' => $tmp[1], 'angle' => $angle, 'status' => 'end', 'p' => $parm, 'nCallback' => $this->nCallback);
										$x = $tmp[0];
										$y = $tmp[1];
										$ret = $this->$func($info);
										if(is_array($ret)){
											// then the return from the callback function could set the position, to start with, later will do font colour, and font
											foreach($ret as $rk => $rv){
												switch($rk){
													case 'x':
													case 'y':
														$$rk = $rv;
														break;
												}
											}
										}
										// also remove from to the stack
										// for simplicity, just take from the end, fix this another day
										$this->nCallback--;
										if($this->nCallback < 0){
											$this->nCallBack = 0;
										}
									}
								}
							}
							break;
					}
					break;
				case 'b':
				case 'i':
					$j++;
					if($text[$j] == '>'){
						$this->currentTextState .= $text[$j - 1];
						$directive = $j - $i + 1;
					}
					break;
				case 'C':
					$noClose = 1;
				case 'c':
					// this this might be a callback function
					$j++;
					$k = strpos($text, '>', $j);
					if($k !== false && $text[$j] == ':'){
						// then this will be treated as a callback directive
						$directive = $k - $i + 1;
						$f = 0;
						// split the remainder on colons to get the function name and the paramater
						//          $bits = explode(':',substr($text,$j+1,$k-$j-1));
						$tmp = substr($text, $j + 1, $k - $j - 1);
						$b1 = strpos($tmp, ':');
						if($b1 !== false){
							$func = substr($tmp, 0, $b1);
							$parm = substr($tmp, $b1 + 1);
						} else{
							$func = $tmp;
							$parm = '';
						}
						if(!isset($func) || !strlen(trim($func))){
							$directive = 0;
						} else{
							// only call the function if this is the final call, ie, the one actually doing printing, not measurement
							if($final){
								// need to assess the text position, calculate the text width to this point
								// can use getTextWidth to find the text width I think
								// also add the text height and decender
								$tmp = $this->PRVTgetTextPosition($x, $y, $angle, $size, $wordSpaceAdjust, substr($text, 0, $i));
								$info = array('x' => $tmp[0], 'y' => $tmp[1], 'angle' => $angle, 'status' => 'start', 'p' => $parm, 'f' => $func, 'height' => $this->getFontHeight($size), 'decender' => $this->getFontDecender($size));
								$x = $tmp[0];
								$y = $tmp[1];
								if(!isset($noClose) || !$noClose){
									// only add to the stack if this is a small 'c', therefore is a start-stop pair
									$this->nCallback++;
									$info['nCallback'] = $this->nCallback;
									$this->callback[$this->nCallback] = $info;
								}
								$ret = $this->$func($info);
								if(is_array($ret)){
									// then the return from the callback function could set the position, to start with, later will do font colour, and font
									foreach($ret as $rk => $rv){
										switch($rk){
											case 'x':
											case 'y':
												$$rk = $rv;
												break;
										}
									}
								}
							}
						}
					}
					break;
			}
		}
		return $directive;
	}

	/**
	 * add text to the document, at a specified location, size and angle on the page
	 */
	function addText($x, $y, $size, $text, $angle = 0, $wordSpaceAdjust = 0){
		if(!$this->numFonts){
			$this->selectFont('./fonts/Helvetica');
		}

		// if there are any open callbacks, then they should be called, to show the start of the line
		if($this->nCallback > 0){
			for($i = $this->nCallback; $i > 0; $i--){
				// call each function
				$info = array('x' => $x, 'y' => $y, 'angle' => $angle, 'status' => 'sol', 'p' => $this->callback[$i]['p'], 'nCallback' => $this->callback[$i]['nCallback'], 'height' => $this->callback[$i]['height'], 'decender' => $this->callback[$i]['decender']);
				$func = $this->callback[$i]['f'];
				$this->$func($info);
			}
		}
		if($angle == 0){
			$this->objects[$this->currentContents]['c'] .= "\n" . 'BT ' . sprintf('%.3f', $x) . ' ' . sprintf('%.3f', $y) . ' Td';
		} else{
			$a = deg2rad((float)$angle);
			$tmp = "\n" . 'BT ';
			$tmp .= sprintf('%.3f', cos($a)) . ' ' . sprintf('%.3f', (-1.0 * sin($a))) . ' ' . sprintf('%.3f', sin($a)) . ' ' . sprintf('%.3f', cos($a)) . ' ';
			$tmp .= sprintf('%.3f', $x) . ' ' . sprintf('%.3f', $y) . ' Tm';
			$this->objects[$this->currentContents]['c'] .= $tmp;
		}
		if($wordSpaceAdjust != 0 || $wordSpaceAdjust != $this->wordSpaceAdjust){
			$this->wordSpaceAdjust = $wordSpaceAdjust;
			$this->objects[$this->currentContents]['c'] .= ' ' . sprintf('%.3f', $wordSpaceAdjust) . ' Tw';
		}
		$len = strlen($text);
		$start = 0;
		for($i = 0; $i < $len; $i++){
			$f = 1;
			$directive = $this->PRVTcheckTextDirective($text, $i, $f);
			if($directive){
				// then we should write what we need to
				if($i > $start){
					$part = substr($text, $start, $i - $start);
					$this->objects[$this->currentContents]['c'] .= ' /F' . $this->currentFontNum . ' ' . sprintf('%.1f', $size) . ' Tf ';
					$this->objects[$this->currentContents]['c'] .= ' (' . $this->filterText($part) . ') Tj';
				}
				if($f){
					// then there was nothing drastic done here, restore the contents
					$this->setCurrentFont();
				} else{
					$this->objects[$this->currentContents]['c'] .= ' ET';
					$f = 1;
					$xp = $x;
					$yp = $y;
					$directive = $this->PRVTcheckTextDirective1($text, $i, $f, 1, $xp, $yp, $size, $angle, $wordSpaceAdjust);

					// restart the text object
					if($angle == 0){
						$this->objects[$this->currentContents]['c'] .= "\n" . 'BT ' . sprintf('%.3f', $xp) . ' ' . sprintf('%.3f', $yp) . ' Td';
					} else{
						$a = deg2rad((float)$angle);
						$tmp = "\n" . 'BT ';
						$tmp .= sprintf('%.3f', cos($a)) . ' ' . sprintf('%.3f', (-1.0 * sin($a))) . ' ' . sprintf('%.3f', sin($a)) . ' ' . sprintf('%.3f', cos($a)) . ' ';
						$tmp .= sprintf('%.3f', $xp) . ' ' . sprintf('%.3f', $yp) . ' Tm';
						$this->objects[$this->currentContents]['c'] .= $tmp;
					}
					if($wordSpaceAdjust != 0 || $wordSpaceAdjust != $this->wordSpaceAdjust){
						$this->wordSpaceAdjust = $wordSpaceAdjust;
						$this->objects[$this->currentContents]['c'] .= ' ' . sprintf('%.3f', $wordSpaceAdjust) . ' Tw';
					}
				}
				// and move the writing point to the next piece of text
				$i = $i + $directive - 1;
				$start = $i + 1;
			}

		}
		if($start < $len){
			$part = substr($text, $start);
			$this->objects[$this->currentContents]['c'] .= ' /F' . $this->currentFontNum . ' ' . sprintf('%.1f', $size) . ' Tf ';
			$this->objects[$this->currentContents]['c'] .= ' (' . $this->filterText($part) . ') Tj';
		}
		$this->objects[$this->currentContents]['c'] .= ' ET';

		// if there are any open callbacks, then they should be called, to show the end of the line
		if($this->nCallback > 0){
			for($i = $this->nCallback; $i > 0; $i--){
				// call each function
				$tmp = $this->PRVTgetTextPosition($x, $y, $angle, $size, $wordSpaceAdjust, $text);
				$info = array('x' => $tmp[0], 'y' => $tmp[1], 'angle' => $angle, 'status' => 'eol', 'p' => $this->callback[$i]['p'], 'nCallback' => $this->callback[$i]['nCallback'], 'height' => $this->callback[$i]['height'], 'decender' => $this->callback[$i]['decender']);
				$func = $this->callback[$i]['f'];
				$this->$func($info);
			}
		}

	}

	/**
	 * calculate how wide a given text string will be on a page, at a given size.
	 * this can be called externally, but is alse used by the other class functions
	 */
	function getTextWidth($size, $text){
		// this function should not change any of the settings, though it will need to
		// track any directives which change during calculation, so copy them at the start
		// and put them back at the end.
		$store_currentTextState = $this->currentTextState;

		if(!$this->numFonts){
			$this->selectFont('./fonts/Helvetica');
		}

		// converts a number or a float to a string so it can get the width
		$text = "$text";

		// hmm, this is where it all starts to get tricky - use the font information to
		// calculate the width of each character, add them up and convert to user units
		$w = 0;
		$len = strlen($text);
		$cf = $this->currentFont;
		for($i = 0; $i < $len; $i++){
			$f = 1;
			$directive = $this->PRVTcheckTextDirective($text, $i, $f);
			if($directive){
				if($f){
					$this->setCurrentFont();
					$cf = $this->currentFont;
				}
				$i = $i + $directive - 1;
			} else{
				$char = ord($text[$i]);
				if(isset($this->fonts[$cf]['differences'][$char])){
					// then this character is being replaced by another
					$name = $this->fonts[$cf]['differences'][$char];
					if(isset($this->fonts[$cf]['C'][$name]['WX'])){
						$w += $this->fonts[$cf]['C'][$name]['WX'];
					}
				} else {
					if(isset($this->fonts[$cf]['C'][$char]['WX'])){
						$w += $this->fonts[$cf]['C'][$char]['WX'];
					}
				}
			}
		}

		$this->currentTextState = $store_currentTextState;
		$this->setCurrentFont();

		return $w * $size / 1000;
	}

	/**
	 * do a part of the calculation for sorting out the justification of the text
	 *
	 * @access private
	 */
	function PRVTadjustWrapText($text, $actual, $width, &$x, &$adjust, $justification){
		switch($justification){
			case 'left':
				return;
				break;
			case 'right':
				$x += $width - $actual;
				break;
			case 'center':
			case 'centre':
				$x += ($width - $actual) / 2;
				break;
			case 'full':
				// count the number of words
				$words = explode(' ', $text);
				$nspaces = count($words) - 1;
				if($nspaces > 0){
					$adjust = ($width - $actual) / $nspaces;
				} else{
					$adjust = 0;
				}
				break;
		}
	}

	/**
	 * add text to the page, but ensure that it fits within a certain width
	 * if it does not fit then put in as much as possible, splitting at word boundaries
	 * and return the remainder.
	 * justification and angle can also be specified for the text
	 */
	function addTextWrap($x, $y, $width, $size, $text, $justification = 'left', $angle = 0, $test = 0){
		// this will display the text, and if it goes beyond the width $width, will backtrack to the 
		// previous space or hyphen, and return the remainder of the text.

		// $justification can be set to 'left','right','center','centre','full'

		// need to store the initial text state, as this will change during the width calculation
		// but will need to be re-set before printing, so that the chars work out right
		$store_currentTextState = $this->currentTextState;

		if(!$this->numFonts){
			$this->selectFont('./fonts/Helvetica');
		}
		if($width <= 0){
			// error, pretend it printed ok, otherwise risking a loop
			return '';
		}
		$w = 0;
		$break = 0;
		$breakWidth = 0;
		$len = strlen($text);
		$cf = $this->currentFont;
		$tw = $width / $size * 1000;
		for($i = 0; $i < $len; $i++){
			$f = 1;
			$directive = $this->PRVTcheckTextDirective($text, $i, $f);
			if($directive){
				if($f){
					$this->setCurrentFont();
					$cf = $this->currentFont;
				}
				$i = $i + $directive - 1;
			} else{
				$cOrd = ord($text[$i]);
				if(isset($this->fonts[$cf]['differences'][$cOrd])){
					// then this character is being replaced by another
					$cOrd2 = $this->fonts[$cf]['differences'][$cOrd];
				} else{
					$cOrd2 = $cOrd;
				}

				if(isset($this->fonts[$cf]['C'][$cOrd2]['WX'])){
					$w += $this->fonts[$cf]['C'][$cOrd2]['WX'];
				}
				if($w > $tw){
					// then we need to truncate this line
					if($break > 0){
						// then we have somewhere that we can split :)
						if($text[$break] == ' '){
							$tmp = substr($text, 0, $break);
						} else{
							$tmp = substr($text, 0, $break + 1);
						}
						$adjust = 0;
						$this->PRVTadjustWrapText($tmp, $breakWidth, $width, $x, $adjust, $justification);

						// reset the text state
						$this->currentTextState = $store_currentTextState;
						$this->setCurrentFont();
						if(!$test){
							$this->addText($x, $y, $size, $tmp, $angle, $adjust);
						}
						return substr($text, $break + 1);
					} else{
						// just split before the current character
						$tmp = substr($text, 0, $i);
						$adjust = 0;
						$ctmp = ord($text[$i]);
						if(isset($this->fonts[$cf]['differences'][$ctmp])){
							$ctmp = $this->fonts[$cf]['differences'][$ctmp];
						}
						$tmpw = ($w - $this->fonts[$cf]['C'][$ctmp]['WX']) * $size / 1000;
						$this->PRVTadjustWrapText($tmp, $tmpw, $width, $x, $adjust, $justification);
						// reset the text state
						$this->currentTextState = $store_currentTextState;
						$this->setCurrentFont();
						if(!$test){
							$this->addText($x, $y, $size, $tmp, $angle, $adjust);
						}
						return substr($text, $i);
					}
				}
				if($text[$i] == '-'){
					$break = $i;
					$breakWidth = $w * $size / 1000;
				}
				if($text[$i] == ' '){
					$break = $i;
					$ctmp = ord($text[$i]);
					if(isset($this->fonts[$cf]['differences'][$ctmp])){
						$ctmp = $this->fonts[$cf]['differences'][$ctmp];
					}
					$breakWidth = ($w - $this->fonts[$cf]['C'][$ctmp]['WX']) * $size / 1000;
				}
			}
		}
		// then there was no need to break this line
		if($justification == 'full'){
			$justification = 'left';
		}
		$adjust = 0;
		$tmpw = $w * $size / 1000;
		$this->PRVTadjustWrapText($text, $tmpw, $width, $x, $adjust, $justification);
		// reset the text state
		$this->currentTextState = $store_currentTextState;
		$this->setCurrentFont();
		if(!$test){
			$this->addText($x, $y, $size, $text, $angle, $adjust, $angle);
		}
		return '';
	}

	/**
	 * this will be called at a new page to return the state to what it was on the
	 * end of the previous page, before the stack was closed down
	 * This is to get around not being able to have open 'q' across pages
	 *
	 */
	function saveState($pageEnd = 0){
		if($pageEnd){
			// this will be called at a new page to return the state to what it was on the 
			// end of the previous page, before the stack was closed down
			// This is to get around not being able to have open 'q' across pages
			$opt = $this->stateStack[$pageEnd]; // ok to use this as stack starts numbering at 1
			$this->setColor($opt['col']['r'], $opt['col']['g'], $opt['col']['b'], 1);
			$this->setStrokeColor($opt['str']['r'], $opt['str']['g'], $opt['str']['b'], 1);
			$this->objects[$this->currentContents]['c'] .= "\n" . $opt['lin'];
			//    $this->currentLineStyle = $opt['lin'];
		} else{
			$this->nStateStack++;
			$this->stateStack[$this->nStateStack] = array(
				'col' => $this->currentColour
			, 'str' => $this->currentStrokeColour
			, 'lin' => $this->currentLineStyle
			);
		}
		$this->objects[$this->currentContents]['c'] .= "\nq";
	}

	/**
	 * restore a previously saved state
	 */
	function restoreState($pageEnd = 0){
		if(!$pageEnd){
			$n = $this->nStateStack;
			$this->currentColour = $this->stateStack[$n]['col'];
			$this->currentStrokeColour = $this->stateStack[$n]['str'];
			$this->objects[$this->currentContents]['c'] .= "\n" . $this->stateStack[$n]['lin'];
			$this->currentLineStyle = $this->stateStack[$n]['lin'];
			unset($this->stateStack[$n]);
			$this->nStateStack--;
		}
		$this->objects[$this->currentContents]['c'] .= "\nQ";
	}

	/**
	 * make a loose object, the output will go into this object, until it is closed, then will revert to
	 * the current one.
	 * this object will not appear until it is included within a page.
	 * the function will return the object number
	 */
	function openObject(){
		$this->nStack++;
		$this->stack[$this->nStack] = array('c' => $this->currentContents, 'p' => $this->currentPage);
		// add a new object of the content type, to hold the data flow
		$this->numObj++;
		$this->o_contents($this->numObj, 'new');
		$this->currentContents = $this->numObj;
		$this->looseObjects[$this->numObj] = 1;

		return $this->numObj;
	}

	/**
	 * open an existing object for editing
	 */
	function reopenObject($id){
		$this->nStack++;
		$this->stack[$this->nStack] = array('c' => $this->currentContents, 'p' => $this->currentPage);
		$this->currentContents = $id;
		// also if this object is the primary contents for a page, then set the current page to its parent
		if(isset($this->objects[$id]['onPage'])){
			$this->currentPage = $this->objects[$id]['onPage'];
		}
	}

	/**
	 * close an object
	 */
	function closeObject(){
		// close the object, as long as there was one open in the first place, which will be indicated by
		// an objectId on the stack.
		if($this->nStack > 0){
			$this->currentContents = $this->stack[$this->nStack]['c'];
			$this->currentPage = $this->stack[$this->nStack]['p'];
			$this->nStack--;
			// easier to probably not worry about removing the old entries, they will be overwritten
			// if there are new ones.
		}
	}

	/**
	 * stop an object from appearing on pages from this point on
	 */
	function stopObject($id){
		// if an object has been appearing on pages up to now, then stop it, this page will
		// be the last one that could contian it.
		if(isset($this->addLooseObjects[$id])){
			$this->addLooseObjects[$id] = '';
		}
	}

	/**
	 * after an object has been created, it wil only show if it has been added, using this function.
	 */
	function addObject($id, $options = 'add'){
		// add the specified object to the page
		if(isset($this->looseObjects[$id]) && $this->currentContents != $id){
			// then it is a valid object, and it is not being added to itself
			switch($options){
				case 'all':
					// then this object is to be added to this page (done in the next block) and 
					// all future new pages. 
					$this->addLooseObjects[$id] = 'all';
				case 'add':
					if(isset($this->objects[$this->currentContents]['onPage'])){
						// then the destination contents is the primary for the page
						// (though this object is actually added to that page)
						$this->o_page($this->objects[$this->currentContents]['onPage'], 'content', $id);
					}
					break;
				case 'even':
					$this->addLooseObjects[$id] = 'even';
					$pageObjectId = $this->objects[$this->currentContents]['onPage'];
					if($this->objects[$pageObjectId]['info']['pageNum'] % 2 == 0){
						$this->addObject($id); // hacky huh :)
					}
					break;
				case 'odd':
					$this->addLooseObjects[$id] = 'odd';
					$pageObjectId = $this->objects[$this->currentContents]['onPage'];
					if($this->objects[$pageObjectId]['info']['pageNum'] % 2 == 1){
						$this->addObject($id); // hacky huh :)
					}
					break;
				case 'next':
					$this->addLooseObjects[$id] = 'all';
					break;
				case 'nexteven':
					$this->addLooseObjects[$id] = 'even';
					break;
				case 'nextodd':
					$this->addLooseObjects[$id] = 'odd';
					break;
			}
		}
	}

	/**
	 * add content to the documents info object
	 */
	function addInfo($label, $value = 0){
		// this will only work if the label is one of the valid ones.
		// modify this so that arrays can be passed as well.
		// if $label is an array then assume that it is key=>value pairs
		// else assume that they are both scalar, anything else will probably error
		if(is_array($label)){
			foreach($label as $l => $v){
				$this->o_info($this->infoObject, $l, $v);
			}
		} else{
			$this->o_info($this->infoObject, $label, $value);
		}
	}

	/**
	 * set the viewer preferences of the document, it is up to the browser to obey these.
	 */
	function setPreferences($label, $value = 0){
		// this will only work if the label is one of the valid ones.
		if(is_array($label)){
			foreach($label as $l => $v){
				$this->o_catalog($this->catalogId, 'viewerPreferences', array($l => $v));
			}
		} else{
			$this->o_catalog($this->catalogId, 'viewerPreferences', array($label => $value));
		}
	}

	/**
	 * extract an integer from a position in a byte stream
	 *
	 * @access private
	 */
	function PRVT_getBytes(&$data, $pos, $num){
		// return the integer represented by $num bytes from $pos within $data
		$ret = 0;
		for($i = 0; $i < $num; $i++){
			$ret = $ret * 256;
			$ret += ord($data[$pos + $i]);
		}
		return $ret;
	}

	/**
	 * add a PNG image into the document, from a file
	 * this should work with remote files
	 */
	function addPngFromFile($file, $x, $y, $w = 0, $h = 0){
		// read in a png file, interpret it, then add to the system
		$error = 0;
		$fp = @fopen($file, 'rb');
		if($fp){
			$data = '';
			while(!feof($fp)){
				$data .= fread($fp, 1024);
			}
			fclose($fp);
		} else{
			$error = 1;
			$errormsg = 'trouble opening file: ' . $file;
		}

		if(!$error){
			$header = chr(137) . chr(80) . chr(78) . chr(71) . chr(13) . chr(10) . chr(26) . chr(10);
			if(substr($data, 0, 8) != $header){
				$error = 1;
				$errormsg = 'this file does not have a valid header';
			}
		}

		if(!$error){
			// set pointer
			$p = 8;
			$len = strlen($data);
			// cycle through the file, identifying chunks
			$haveHeader = 0;
			$info = array();
			$idata = '';
			$pdata = '';
			while($p < $len){
				$chunkLen = $this->PRVT_getBytes($data, $p, 4);
				$chunkType = substr($data, $p + 4, 4);
				//      echo $chunkType.' - '.$chunkLen.'<br>';

				switch($chunkType){
					case 'IHDR':
						// this is where all the file information comes from
						$info['width'] = $this->PRVT_getBytes($data, $p + 8, 4);
						$info['height'] = $this->PRVT_getBytes($data, $p + 12, 4);
						$info['bitDepth'] = ord($data[$p + 16]);
						$info['colorType'] = ord($data[$p + 17]);
						$info['compressionMethod'] = ord($data[$p + 18]);
						$info['filterMethod'] = ord($data[$p + 19]);
						$info['interlaceMethod'] = ord($data[$p + 20]);
						//print_r($info);
						$haveHeader = 1;
						if($info['compressionMethod'] != 0){
							$error = 1;
							$errormsg = 'unsupported compression method';
						}
						if($info['filterMethod'] != 0){
							$error = 1;
							$errormsg = 'unsupported filter method';
						}
						break;
					case 'PLTE':
						$pdata .= substr($data, $p + 8, $chunkLen);
						break;
					case 'IDAT':
						$idata .= substr($data, $p + 8, $chunkLen);
						break;
					case 'tRNS':
						//this chunk can only occur once and it must occur after the PLTE chunk and before IDAT chunk 
						//print "tRNS found, color type = ".$info['colorType']."<BR>"; 
						$transparency = array();
						if($info['colorType'] == 3){ // indexed color, rbg 
							/* corresponding to entries in the plte chunk 
          Alpha for palette index 0: 1 byte 
          Alpha for palette index 1: 1 byte 
          ...etc... 
          */
							// there will be one entry for each palette entry. up until the last non-opaque entry.
							// set up an array, stretching over all palette entries which will be o (opaque) or 1 (transparent)
							$transparency['type'] = 'indexed';
							$numPalette = strlen($pdata) / 3;
							$trans = 0;
							for($i = $chunkLen; $i >= 0; $i--){
								if(ord($data[$p + 8 + $i]) == 0){
									$trans = $i;
								}
							}
							$transparency['data'] = $trans;

						} elseif($info['colorType'] == 0){ // grayscale 
							/* corresponding to entries in the plte chunk 
          Gray: 2 bytes, range 0 .. (2^bitdepth)-1 
          */
							//            $transparency['grayscale']=$this->PRVT_getBytes($data,$p+8,2); // g = grayscale 
							$transparency['type'] = 'indexed';
							$transparency['data'] = ord($data[$p + 8 + 1]);

						} elseif($info['colorType'] == 2){ // truecolor 
							/* corresponding to entries in the plte chunk 
          Red: 2 bytes, range 0 .. (2^bitdepth)-1 
          Green: 2 bytes, range 0 .. (2^bitdepth)-1 
          Blue: 2 bytes, range 0 .. (2^bitdepth)-1 
          */
							$transparency['r'] = $this->PRVT_getBytes($data, $p + 8, 2); // r from truecolor 
							$transparency['g'] = $this->PRVT_getBytes($data, $p + 10, 2); // g from truecolor 
							$transparency['b'] = $this->PRVT_getBytes($data, $p + 12, 2); // b from truecolor 

						} else{
							//unsupported transparency type 
						}
						// KS End new code 
						break;
					default:
						break;
				}

				$p += $chunkLen + 12;
			}

			if(!$haveHeader){
				$error = 1;
				$errormsg = 'information header is missing';
			}
			if(isset($info['interlaceMethod']) && $info['interlaceMethod']){
				$error = 1;
				$errormsg = 'There appears to be no support for interlaced images in pdf.';
			}
		}

		if(!$error && $info['bitDepth'] > 8){
			$error = 1;
			$errormsg = 'only bit depth of 8 or less is supported';
		}

		if(!$error){
			if($info['colorType'] != 2 && $info['colorType'] != 0 && $info['colorType'] != 3){
				$error = 1;
				$errormsg = 'transparancey alpha channel not supported, transparency only supported for palette images.';
			} else{
				switch($info['colorType']){
					case 3:
						$color = 'DeviceRGB';
						$ncolor = 1;
						break;
					case 2:
						$color = 'DeviceRGB';
						$ncolor = 3;
						break;
					case 0:
						$color = 'DeviceGray';
						$ncolor = 1;
						break;
				}
			}
		}
		if($error){
			$this->addMessage('PNG error - (' . $file . ') ' . $errormsg);
			return;
		}
		if($w == 0){
			$w = $h / $info['height'] * $info['width'];
		}
		if($h == 0){
			$h = $w * $info['height'] / $info['width'];
		}
		//print_r($info);
		// so this image is ok... add it in.
		$this->numImages++;
		$im = $this->numImages;
		$label = 'I' . $im;
		$this->numObj++;
		//  $this->o_image($this->numObj,'new',array('label'=>$label,'data'=>$idata,'iw'=>$w,'ih'=>$h,'type'=>'png','ic'=>$info['width']));
		$options = array(
			'label' => $label, 'data' => $idata, 'bitsPerComponent' => $info['bitDepth'], 'pdata' => $pdata
		, 'iw' => $info['width'], 'ih' => $info['height'], 'type' => 'png', 'color' => $color, 'ncolor' => $ncolor
		);
		if(isset($transparency)){
			$options['transparency'] = $transparency;
		}
		$this->o_image($this->numObj, 'new', $options);

		$this->objects[$this->currentContents]['c'] .= "\nq";
		$this->objects[$this->currentContents]['c'] .= "\n" . sprintf('%.3f', $w) . " 0 0 " . sprintf('%.3f', $h) . " " . sprintf('%.3f', $x) . " " . sprintf('%.3f', $y) . " cm";
		$this->objects[$this->currentContents]['c'] .= "\n/" . $label . ' Do';
		$this->objects[$this->currentContents]['c'] .= "\nQ";
	}

	/**
	 * add a JPEG image into the document, from a file
	 */
	function addJpegFromFile($img, $x, $y, $w = 0, $h = 0){
		// attempt to add a jpeg image straight from a file, using no GD commands
		// note that this function is unable to operate on a remote file.

		if(!file_exists($img)){
			return;
		}

		$tmp = getimagesize($img);
		$imageWidth = $tmp[0];
		$imageHeight = $tmp[1];

		if(isset($tmp['channels'])){
			$channels = $tmp['channels'];
		} else{
			$channels = 3;
		}

		if($w <= 0 && $h <= 0){
			$w = $imageWidth;
		}
		if($w == 0){
			$w = $h / $imageHeight * $imageWidth;
		}
		if($h == 0){
			$h = $w * $imageHeight / $imageWidth;
		}

		$fp = fopen($img, 'rb');

		$data = fread($fp, filesize($img));

		fclose($fp);

		$this->addJpegImage_common($data, $x, $y, $w, $h, $imageWidth, $imageHeight, $channels);
	}

	/**
	 * add an image into the document, from a GD object
	 * this function is not all that reliable, and I would probably encourage people to use
	 * the file based functions
	 */
	function addImage(&$img, $x, $y, $w = 0, $h = 0, $quality = 75){
		// add a new image into the current location, as an external object
		// add the image at $x,$y, and with width and height as defined by $w & $h

		// note that this will only work with full colour images and makes them jpg images for display
		// later versions could present lossless image formats if there is interest.

		// there seems to be some problem here in that images that have quality set above 75 do not appear
		// not too sure why this is, but in the meantime I have restricted this to 75.  
		if($quality > 75){
			$quality = 75;
		}

		// if the width or height are set to zero, then set the other one based on keeping the image
		// height/width ratio the same, if they are both zero, then give up :)
		$imageWidth = imagesx($img);
		$imageHeight = imagesy($img);

		if($w <= 0 && $h <= 0){
			return;
		}
		if($w == 0){
			$w = $h / $imageHeight * $imageWidth;
		}
		if($h == 0){
			$h = $w * $imageHeight / $imageWidth;
		}

		// gotta get the data out of the img..

		// so I write to a temp file, and then read it back.. soo ugly, my apologies.
		$tmpDir = '/tmp';
		$tmpName = tempnam($tmpDir, 'img');
		imagejpeg($img, $tmpName, $quality);
		$fp = fopen($tmpName, 'rb');

		$fp = @fopen($tmpName, 'rb');
		if($fp){
			$data = '';
			while(!feof($fp)){
				$data .= fread($fp, 1024);
			}
			fclose($fp);
		} else{
			$error = 1;
			$errormsg = 'trouble opening file';
		}
		//  $data = fread($fp,filesize($tmpName));
		//  fclose($fp);
		unlink($tmpName);
		$this->addJpegImage_common($data, $x, $y, $w, $h, $imageWidth, $imageHeight);
	}

	/**
	 * common code used by the two JPEG adding functions
	 *
	 * @access private
	 */
	function addJpegImage_common(&$data, $x, $y, $w = 0, $h = 0, $imageWidth, $imageHeight, $channels = 3){
		// note that this function is not to be called externally
		// it is just the common code between the GD and the file options
		$this->numImages++;
		$im = $this->numImages;
		$label = 'I' . $im;
		$this->numObj++;
		$this->o_image($this->numObj, 'new', array('label' => $label, 'data' => $data, 'iw' => $imageWidth, 'ih' => $imageHeight, 'channels' => $channels));

		$this->objects[$this->currentContents]['c'] .= "\nq";
		$this->objects[$this->currentContents]['c'] .= "\n" . sprintf('%.3f', $w) . " 0 0 " . sprintf('%.3f', $h) . " " . sprintf('%.3f', $x) . " " . sprintf('%.3f', $y) . " cm";
		$this->objects[$this->currentContents]['c'] .= "\n/" . $label . ' Do';
		$this->objects[$this->currentContents]['c'] .= "\nQ";
	}

	/**
	 * specify where the document should open when it first starts
	 */
	function openHere($style, $a = 0, $b = 0, $c = 0){
		// this function will open the document at a specified page, in a specified style
		// the values for style, and the required paramters are:
		// 'XYZ'  left, top, zoom
		// 'Fit'
		// 'FitH' top
		// 'FitV' left
		// 'FitR' left,bottom,right
		// 'FitB'
		// 'FitBH' top
		// 'FitBV' left
		$this->numObj++;
		$this->o_destination($this->numObj, 'new', array('page' => $this->currentPage, 'type' => $style, 'p1' => $a, 'p2' => $b, 'p3' => $c));
		$id = $this->catalogId;
		$this->o_catalog($id, 'openHere', $this->numObj);
	}

	/**
	 * create a labelled destination within the document
	 */
	function addDestination($label, $style, $a = 0, $b = 0, $c = 0){
		// associates the given label with the destination, it is done this way so that a destination can be specified after
		// it has been linked to
		// styles are the same as the 'openHere' function
		$this->numObj++;
		$this->o_destination($this->numObj, 'new', array('page' => $this->currentPage, 'type' => $style, 'p1' => $a, 'p2' => $b, 'p3' => $c));
		$id = $this->numObj;
		// store the label->idf relationship, note that this means that labels can be used only once
		$this->destinations["$label"] = $id;
	}

	/**
	 * define font families, this is used to initialize the font families for the default fonts
	 * and for the user to add new ones for their fonts. The default bahavious can be overridden should
	 * that be desired.
	 */
	function setFontFamily($family, $options = ''){
		if(!is_array($options)){
			if($family == 'init'){
				// set the known family groups
				// these font families will be used to enable bold and italic markers to be included
				// within text streams. html forms will be used... <b></b> <i></i>
				$this->fontFamilies['Helvetica.afm'] = array(
					'b' => 'Helvetica-Bold.afm'
				, 'i' => 'Helvetica-Oblique.afm'
				, 'bi' => 'Helvetica-BoldOblique.afm'
				, 'ib' => 'Helvetica-BoldOblique.afm'
				);
				$this->fontFamilies['Courier.afm'] = array(
					'b' => 'Courier-Bold.afm'
				, 'i' => 'Courier-Oblique.afm'
				, 'bi' => 'Courier-BoldOblique.afm'
				, 'ib' => 'Courier-BoldOblique.afm'
				);
				$this->fontFamilies['Times-Roman.afm'] = array(
					'b' => 'Times-Bold.afm'
				, 'i' => 'Times-Italic.afm'
				, 'bi' => 'Times-BoldItalic.afm'
				, 'ib' => 'Times-BoldItalic.afm'
				);
			}
		} else{
			// the user is trying to set a font family
			// note that this can also be used to set the base ones to something else
			if(strlen($family)){
				$this->fontFamilies[$family] = $options;
			}
		}
	}

	/**
	 * used to add messages for use in debugging
	 */
	function addMessage($message){
		$this->messages .= $message . "\n";
	}

	/**
	 * a few functions which should allow the document to be treated transactionally.
	 */
	function transaction($action){
		switch($action){
			case 'start':
				// store all the data away into the checkpoint variable
				$data = get_object_vars($this);
				$this->checkpoint = $data;
				unset($data);
				break;
			case 'commit':
				if(is_array($this->checkpoint) && isset($this->checkpoint['checkpoint'])){
					$tmp = $this->checkpoint['checkpoint'];
					$this->checkpoint = $tmp;
					unset($tmp);
				} else{
					$this->checkpoint = '';
				}
				break;
			case 'rewind':
				// do not destroy the current checkpoint, but move us back to the state then, so that we can try again
				if(is_array($this->checkpoint)){
					// can only abort if were inside a checkpoint
					$tmp = $this->checkpoint;
					foreach($tmp as $k => $v){
						if($k != 'checkpoint'){
							$this->$k = $v;
						}
					}
					unset($tmp);
				}
				break;
			case 'abort':
				if(is_array($this->checkpoint)){
					// can only abort if were inside a checkpoint
					$tmp = $this->checkpoint;
					foreach($tmp as $k => $v){
						$this->$k = $v;
					}
					unset($tmp);
				}
				break;
		}

	}

} // end of class
